---Let me start with saying that I am a near diehard Canon fan. I fell in love with the 5d mk2 (for stills and video), and what the camera was able to do (along with Magic Lantern) amazed me. I was lucky and got one a week after they were released. The 5d mk3 was an improvement, but it wasn’t until Magic Lantern released a firmware that allowed it to shoot RAW video that I decided to get one. The 5dmk3 has been my go-to camera for just about everything stills and video for several years. Then the Canon 5ds was announced, and that part of me that had been itching for larger quality stills rejoiced. Here it was, a 50mp full frame sensor, which from the initial leak seemed to be just a higher megapixel 5dmk3. But after more info was released, and getting my hands on one of the pre-production models at a trade show I was sadly let down. It was more like a 5dmk2 with more megapixels. Lots of noise, and a similar ISO range. Being that I was in search of more megapixels I pre-ordered the Canon 5ds. Just as I got my ship confirmation Sony announced and opened pre-orders for the A7R2. I had always looked at the mirrorless cameras as the likely future of image making (after all the video cameras I shoot with don’t have mirrors that flop up and down). So after seeing the specs, nearly double the megapixels of the Canon 5dmk3, a better ISO range than the 5ds, built in image stabilization, and last but not least the ability to shoot 4k video. I immediately canceled my Canon 5ds order and pre-ordered the Sony with a lens adapter. I know that was a lot of a background there, but what follows now is what I discovered after shooting on and off with the camera after a few weeks.
---One of the first things I did was put every canon lens I own (or could borrow) on the adapter and see how it performed.
Here is a list of the lenses I found that seemed to work well (very close to the auto focusing speed of the canon lens on a canon).
70-200mm f/2.8 mk2
Here are lenses that I tried that worked ok, but not great.
Here are the lenses that I tried that did not work at all.
While the majority of the lenses i tried worked well, I found that overall performance on all the lenses was greatly reduced if the lighting was low. So you could have a good auto focusing lens go to bad if the lighting was not great. For me not a deal breaker since most of what I use my full frame cameras for is landscape, astrophotography, and video.
---Next I went out and see how the image quality compared to my 5dmk3. Below are some of the stills I took (same lens, settings, on both cameras). Over all I was pleased with the extra megapixels, I was able to make out more details in areas that the mk3 just saw blobs.
CLICK ON IMAGES TO ENLARGE
The Sony seemed to have slightly more dynamic range but seemed to deal with highlights slightly less as well. Since I love to use my Canon to do astrophotography I also had to try out some long exposures. I first went out and tried to snap some images with the Sony. What I noticed was that the Sony performed very similar to the mk3 but that it had more noise in the shadows.
CLICK ON IMAGES TO ENLARGE
So I did another test. This time with the lens caps on, just shooting 30 second exposures at two high ISOs. What I found was that at higher ISO ranges (over 1250) the Canon performed better, but the Sony was better at the lower ISOs.
Then I turned on the long exposure noise reduction and was extremely pleased with what it did.
When I compared the video (1080p30 as the Canon does not do 4K) from both full frame cameras I saw a ton more detail from the Sony. Not to mention that I am able to shoot 720p120 on the sony, as well as shoot video in either full frame or super 35 crop mode.
---Final thoughts: For me the Sony A7r2 was similar, in its release excitement, as the 5dmk2. I always felt like Canon put just enough features in the 5dmk3 to take a small step forward. The Sony feels like several steps forward. While it is not the perfect camera, it for me will replace my Canon 5d mk3 very well. Perhaps not in every situation, but I feel that I can work around most of my issues and the benefits outweigh that effort. Cause in the end I am a Canon fan (still keeping the glass), but I am not brand loyal. I’ll use whatever brand that has the best features.
If you'd like to see any of the original files feel free to e-mail me.