I have reached the point where a substantial upgrade is required and afforded to aid in my wedding work. I currently shoot with a 50D + 17-55 f/2.8IS + 60mm f/2 macro + 11-16 f/2.8 + (Rent) 70-200 f/2.8. My plan: Buy a 5DMKII to use as my main body, with the 50D as my 2nd. I also plan on selling every lens I currently have, as they are all EF-S and I would like to be able to use any lens on either body. I plan on... - Replacing the 17-55 f/2.8IS with the 24-70 f/2.8L ( I wish I could use this on EF! I love my 17-55!!!) I am also considering keeping it and keeping it almost permanently mounted on my 50D as my main camera, but that would almost defeat the point of spending big bucks on the 5DMKII if i ended up using the 50D for most of the shots... - Replacing the 60mm f/2 macro with the 100mm f/2.8ISL macro. - Replacing the 11-16 f/2.8 UWA with the 16-35 f/2.8L I (Get an extra mm in the wide end with this on EF, and keep the 2.8, woohoo!) - Buying a 70-200 f/4LIS. This is a big question. I figure With the 5DMKII ISO capabilities, I can make the f/4 with IS work out good enough. Besides that, the 2.8IS is ungodly heavy, and I have heard the overall IQ on the f/4 is significantly better than the 2.8. Thoughts? Does anyone have any better lens ideas?? Will these 2.8 lenses be able to keep up in the near dark of churches when coupled with the high ISO of the 5DMKII, because it seems like the photo community is split between "PRIMES!" and "L ZOOMS!" I would totally go with the fast primes, but I am trying to get over my bad habit of shooting everything wide open, and am worried that once I do a wedding or two with them, I will decide that I would rather deal with the Noise (fixable) than the mega-shallow-focus shots (not fixable).