I currently use a 150mm Rodagon. However since I most often enlarge 4x5 negatives to 8x10, and more rarely 11x14, I'm thinking about a shorter focal length. I don't think a 135mm would make much of a difference but maybe a 120mm would be nice. I'm thinking about a Schneider 120mm HM.

I have zero complaints about sharpness or anything like that. Just wondering if falloff will become more of a noticeable nuisance with a 120 stopped down say one to two stops vs the 150.