
I'd say on a full-frame 5D go ahead and get the 35L. I REALLY want both lenses some day. I am probably going to get the 35L first though. Even though it would be used on a crop-sensor camera. I actually ordered it for rental last night for a two-week rental. Should be here tomorrow! That may be a mistake because then I'll just have to purchase it! I believe if I had it it would be the most used lens in my bag. Gotta love fast sharp glass!
IMO, the 35L shines brightest on the 1.6 crops, your gonna love it. I was a DOF whore for weeks after that combo...LOL