I agree, image quality needs vary from photographer to photographer. Doing this as a hobbyist and for a living the past 50 + years I have used camera systems at all levels of image quality.

For me, I will never willingly go back to less image quality as I have now with my fullframe 50mp A1, and fullframe 61mp A7RIV.

I do also own the video-centric A7SIII which only has a 12mp sensor. I use that for impromptu still shots at family gatherings where I can quickly share shots that will never be seen larger than on a computer or smartphone screen. .

But when I make the extra effort to light and take family photos on scouted locations or in the studio that will be printed and are for posterity, I use my A7RIV or my A1. And when I shoot wildlife, portraits, sports, fashion, landscapes, weddings, corporate client work, etc., I want always to use the best image quality gear I can afford. Just the way I roll. I am 71 years old, how long am I supposed to wait until I graduate to the top image quality gear that I can afford? LOL

Here some family Xmas shots I made of my nephew and his family, along a stream in a public park location that I scouted out a week in advance. Knowing I would need to use three strobe lights to get the images and lighting ratios I wanted; and knowing I would need to trudge all my lighting gear, strobes, stands ,sandbags, plus cameras and lenses all out to the remote location, and knowing the effort they were also making with a young baby to get him ready, awake and alert, there was no way I was going to shoot these images with my 12mp A7SIII. Just the way I roll.

After they saw the images, they told me they will cherish these 150 shots forever. They deserved my best efforts and the best image quality I could give them.

Your choices and needs , and the choices and needs of the OP may vary, and there is nothing wrong about that for you both. I make my living with my camera gear, I want to use the best tools that I can afford to help me do the best job.

Here just a couple of the nearly 150 shots I made there that day, all shot with my 50mp fullframe Sony A1. Three Godox AD200Pro strobes, Sony 24-105mm f4 G OSS, Sony 135mm f1.8 GM , and Sony 24mm f1.4 GM lenses.

Cheers and best to you all. Use what works for you and be happy.

Before you dump your Nikon and start over with Sony, you might want to look at these videos. On January 4th at CES in Las Vegas, Panasonic Lumix introduced a remarkable new tool. It competes extremely well with the Sony A7 IV as well as Canon and Nikon models in that $2500 price range. It has impressed dozens of camera reviewers with its well-rounded stills and video feature set:

https://youtu.be/eDAKWDK3H8E — Emily at Micro Four Nerds reviews the Lumix S5II (about 14 minutes)

https://youtu.be/A06GnDOx0vE — Hugh Brownstone at Three Blind Men and an Elephant reviews the Lumix S5 II (about 27 minutes)

https://youtu.be/FYebjEgf3J0 — Gerald Undone reviews the Lumix S5 II (about 25 minutes)

https://youtu.be/WjvZgZSpRWU?t=99 — Panasonic's Lumix S5 II and IIx introduction at CES (Warning: about 50 minutes, with parts full of geeky specs that some of us drool over)

https://youtu.be/Y5auV2JC7fc — Richard Wong Reviews the Lumix S5 II (Very long 1:38, thick Asian accent, but THOROUGH review with many great comparison tests)

If you want BOTH great stills and fantastic video performance for $2000 in a full frame camera, this is apparently it. I can attest from seven years of using Lumix that no stills camera company puts better video recording features in their cameras. Panasonic's only major flaw has been their continuous tracking autofocus, and they just solved that problem spectacularly well, as you can see in these reviews.

I have tried in vain to find a BAD review of this camera, and haven't seen one yet.

All reviews on YouTube: https://www.youtube.com/results?search_query=Lumix+s5+ii+reviews

Long list of compatible lenses: https://alikgriffin.com/list-of-l-mount-lenses/

I own a Sony A7iv. It is quite the beast! My upgrade from the A7lll to the A7iv was professional, and it was well worth it. The A7iv is so fast to focus, and has more options, that it can do, as well as more MP (33 vs 24). But you must understand that you are getting involved in a "system" change in so many ways. You are not only changing from DSLR to "mirrorless", but you are changing from the Nikon logic to the Sony logic. So many people have made that change, so you will be in good company, but be kind to yourself as you climb the learning curve. All of the lenses that are available to you is astounding! You can buy an adapter to use your current Nikon lenses, and set the camera to use just the APS-C part of the sensor. You can buy an LA-EA5 adapter and use any of millions of Sony, Minolta, Sigma, and Tamron lenses that were made for the Sony "A" mount system and have great autofocus. Or you can buy the amazing "E" mount lenses with the fastest autofocus. The journey you are about to take will make you a better photographer, no matter which system you choose. But I can promise you that the A7iv is a totally amazing piece of equipment that will astound you with it's capabilities, and provide more options for growth.

Before you dump your Nikon and start over with Sony, you might want to look at these videos. On January 4th at CES in Las Vegas, Panasonic Lumix introduced a remarkable new tool. It competes extremely well with the Sony A7 IV as well as Canon and Nikon models in that $2500 price range. It has impressed dozens of camera reviewers with its well-rounded stills and video feature set:

Thank you!

https://youtu.be/eDAKWDK3H8E — Emily at Micro Four Nerds reviews the Lumix S5II (about 14 minutes)

https://youtu.be/A06GnDOx0vE — Hugh Brownstone at Three Blind Men and an Elephant reviews the Lumix S5 II (about 27 minutes)

https://youtu.be/FYebjEgf3J0 — Gerald Undone reviews the Lumix S5 II (about 25 minutes)

https://youtu.be/WjvZgZSpRWU?t=99 — Panasonic's Lumix S5 II and IIx introduction at CES (Warning: about 50 minutes, with parts full of geeky specs that some of us drool over)

https://youtu.be/Y5auV2JC7fc — Richard Wong Reviews the Lumix S5 II (Very long 1:38, thick Asian accent, but THOROUGH review with many great comparison tests)

If you want BOTH great stills and fantastic video performance for $2000 in a full frame camera, this is apparently it. I can attest from seven years of using Lumix that no stills camera company puts better video recording features in their cameras. Panasonic's only major flaw has been their continuous tracking autofocus, and they just solved that problem spectacularly well, as you can see in these reviews.

I have tried in vain to find a BAD review of this camera, and haven't seen one yet.

All reviews on YouTube: https://www.youtube.com/results?search_query=Lumix+s5+ii+reviews

Long list of compatible lenses: https://alikgriffin.com/list-of-l-mount-lenses/