Which focal length do you use more?
I dislike 50mm... I think it's difficult to use well. I've never used the Sigma 30mm f1.4 but that's my preferred focal length on APS-C so I'd consider that, too, but obviously only if it's also your favorite focal length on APS-C!
I also quite like the 22mm, but that's not a focal length that's widely available.
And I would like those two... 50mm and 35mm are my favorite focal lengths on FF.