When I got a ff I was surprised how wide 24mm was. I did the math before hand and understood what would happen, but I was so used to shooting at 24mm with the 7D. But you soon get used to it and I have since got a 16-35 that I use a lot (time to sell the 24-105). The 400mm is going to be at the other spectrum of the issue, but if you keep your 7D you will not have a problem, but I found I could crop the ff files more than the 7D.

If it was me, I think the ff would be my goto camera for landscapes... not the 7D because the noise is controlled better (especially in low light).

After all other considerations, the big improvement the ff cameras will give you is the high ISO capability and the better control of noise overall (which also equates to more head room in sharpening and lifting shadows in pp). I found this alone solved a lot of the problems I had with the 7D. A lot of low light shots will open up for you. However, the low light improvements will be less so if you go to far back into earlier generations of camera's. This is why everyone is pushing the 6D over the 5D II.

By the way... my 7D never got used anymore. I gave it to my nephew.

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