The reason I have decided to move to full frame is mainly due to the fact that I dislike the quality of images in lower light that my A77 does. Since I was going to "upgrade" I decided on Nikon FF. My decision on the Nikon was based on comparing the images from my friends D800 (not sure if its an e) to what I took.
Yes I know its not a fair compairing the two but I liked how sharp his came out and in my eyes, mine where no where near as sharp.
For landscapes the A77 works fine but I dislike it for studio.
Also I have submitted shots to a few magazines that were published. You can see the difference between my shots and the others, not the composition but the whole image.
Im going to keep the Sony as a backup and also for my wife to play with if she decides.
If it's sharp you want the D7100 is very sharp as Jake highlighted. I don't know anything about the A77. The D800 can be very good if you do everything properly like tripods etc. Even handheld I find it pretty good with a reasonable shutter speed.. I only raise the point because I went full frame before the D7100 came out as I convinced myself it was the right thing to do. I now know I could get very similar results with the D7100 for my personal use (no huge prints). I was out with my wife the other day and she had her D7100 with Sigma 17-50 2.8 attached. I was a little envious of how good her pictures looked on the back of the camera.
If you know you need FX then go for it, I just tend to ask the question these days based on my experiences.
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