I normally use a CZ 15 mm or a Canon 35-105 mm on my M10/C300. any of you use longer lenses? I have tried the 2/135 mm and that's ok handling wise, all tough the frame is a bit difficult.
I've used the the Canon 70-200 all the way out to 200mm on our Epics. It's a challenge to frame things, but the results were quite nice in the end.