The lens is quite small and not front heavy at all on the Nex-5N.

I think I'll try the FA 31 f1.8 next time out. A beautiful lens and one of the best ever made by any manufacturer. But, it is a lot longer than the 43 f1.9 and weighs nearly double, so it might be a better idea to put it on the Nex7 because it's bigger and I can grip it better. I should also think that there will be a lot of difference in image rendition between the two cameras. Alright, I'll have to test it on both.