I have found cathedral interiors are lit well enough to support a quality camera body/F4 lens like you have.
Remember, tours move rather briskly and there is little time to swap out lenses, and you don't want to be "That Guy/Gal" holding up the tour causing others to miss seeing the sights.
In such cases, I would shoot interiors at F4 (wide open), use the reciprocal shutter speed rule (1 over the length of the lens, 1/60 sec for the 12-70mm lens), and set the ISO setting to "Auto".
Now you "have the shot" and it will not be blurry (Shutter Speed - set too slow) and your Depth of Field will be good using F4.
Important to note that "Noise" is "Fixable" and "Blur" and "Focus" are not.
When you return home you may correct "Noise" in post-processing using PhotoShop, Topaz Photo AI, or another quality specialty editing program that will DeNoise/Sharpen your treasures.
Best Wishes for safe travels, take many pics and share your best with us here on UHH.
Remember to always . . . .
Smile,
JimmyT Sends

PS: Practice in any dimly lit place BEFORE you go to see what to expect and correct accordingly.
Also, consider the "P" and "A" settings on your camera body as they can be of great help in Lo-Light settings for such an Expen$ive Trip.
I expect to be severly Flogged for the previous comment, sigh.

Stepping away from comparing specs, is there a camera that you just like?

It could be ease of use, results, handling, fun to use or any of those and more. It may even be a camera that you return to even when, by some measures, it is obsolete.

My 2012 Pentax X-5 "Superzoom" 16 MP bridge camera is one. I was surprised they were still going for around $120 when most others from that time were $30.

Fast handling, easy control, but not much manual exposure options and a decent lens. It does have some visual highlight/shadow warnings that are handy in the less-than-perfect EVF. More than once I've returned to it, or rediscovered shots taken with it that I liked.

Thoughts?

Hmm.... Could be, but....

There has always been a distinction between serious photographers and snap-shooters. For me, by definition, a "serious" photographer will always think "about how the subject is presented" regardless of how easy the camera makes the picture-taking process.

I think most digital photographers consider at least some editing to be part of the overall process. In this context, camera settings and post-adjustments are in a basket of options for getting what you want. Maybe some photographers have shifted more of the adjustments to post. And perhaps that can be viewed as a lessening of creativity at the camera end of the business.

It is interesting that smart-phones, the cameras of the masses, are incorporating more and more creative controls!?