You can read all about the comparisons online, but it will likely be the standard one day.

I use a Nikon D300s and D200 for work (mostly still life forensic scenes), but have a NEX 6 for home that I bought in Dec of 2013. I researched for over half a year before getting the NEX-6, then Sony released to A6000 and I was full of buyer’s remorse. I decided to not look back and enjoy the NEX.

After a year, here are few personal notes:

I almost never use the Nikons for family events anymore and have even used it for some limited work because it will shoot in raw. I have not purchased a flash yet, but the few I tried do not communicate with the NEX other than full power trigger.

Positives:
Better low light shots, size, huge sensor, I can use my old Nikon glass, flash can flip up for simple bounce, size, 1080p movies, no loss viewfinder (I really need a viewfinder), smartphone control when it’s on a tripod for group photos that include me, fits in a jacket pocket, it is the future now.

Complaints:
Battery life.
It still feels small in my large hands, because it is small. Many, many years of holding a metal body Nikon leaves a kind of phantom loss feeling.
Speed. Not fast focus for sports (kids soccer) with the autofocus pancake lens it came with (16-50mm).
I have adaptors for my Nikon glass (35mm, 50mm, 18-200mm, 75-300mm?) and the images comparable to the Nikon bodies, but I really miss auto focus that is lost with I adapt the Nikon lenses. Yes, there is a cool focus feature that highlights to focus region, but for moving kids and pets, manual focus images for me are more often not in focus. I just do not have the correct lens for distant action shots.

Odd balance. With the Nikon 18-200mm lens, the device is unbalanced due to the lens weight and that will take getting used to. I rented a 18-200 Sony E mount lens and it is also over one pound and long (four inches). It was nice, but over $1000 and all motorized. It is what it is. The smaller body size is a benefit, but the balance for me is off and it’s very unbalanced on a tripod with my adapted lenses. The all in one 18-200 Sony will still fit in larger jacket pockets, but also gets heavy quickly.

People may prejudge you as less than professional using a mirrorless, but those who do are usually not experts anyway, therefore you are less intimidating looking when you are capturing life as it happens.

When I use non Sony lenses with the Nikon lens adapter, the Nikon/Nikkor lenses need to manually focused.

I also downsized to a NEX-6, but was insanely bummed to see the upgrade and name change a few months later to A6000. It took over half a year to get the NEX-6 and i kept looking for clues about an upgrade rumors, but the A6000 release early 2014 blindsided me. I like the camera, but am stuck with it now and filled with doubt about my decision not to wait another month. AF is quick and fine, but I often use my Nikkor prime and zoom lenses for some shots. i do miss autofocus and now need a zoom lens for soccer games with an autofocus. At a distance, the viewfinder looks in focus (I use the red phase contrast assist) but photos are often in-focus behind the subject. it is a learning curve thing with non sony lenses that i expected, but am slow to adapt to. now I need a $1000 Sony zoom lens too. One of the reasons I picked the NEX-6 was low light performance and the A6000 has the "backlit" chip. I do not have the funds to take a trade in loss for an A-6000.

I am a forensic scientist and photography is used to help document, enhance, enlarge and compare items from crime scenes in sizes ranging from 5micrometer wide paint component samples to bullet trajectories into objects (cars, houses) imaged from above and everything in-between. Composition is not as critical as technical content in my images, though i want to be better in composing beautiful images as well as accurate depictions of what is there outside of the lab. We have Nikon backs and lenses, and Leica and Olympus products for microscopy. I have enjoyed lurking on this site for about a year now, and it is part of my morning routine now.

My LCD screen also does that, but the colors get uniform when I tilt the monitor back. There is a built in polarizer in my screen that I just verified exists. I looked at my screen through a pol filter and rotated the filter until the screen went black. Tilt angle really matters. My screen needs to tilt back to an illogical 17-20 degrees or so back to be uniform yellow. Yes, I measured the angle.