I too have UV filters on all of my lenses (B+W on my L series glass).
Not only that, if you shoot RAW, you can easily achieve (and better control) the effects of such filters by shooting normally in Adobe Camera RAW or Lightroom.
Canon FTW! I jumped on the Canon DSLR bandwagon in 2003 (D60) and continue to be amazed by the quality of the two L series lenses (70-200 F2.8L IS, 16-35 F2.8L) I have owned since then. There's nothing like having a piece of quality glass on a crop body only to find new life on a full frame one...though their situational usefulness definitely shifts. The 16-35 was my normal lens on the crop bodies, but now I find it a bit too wide for most shooting. The 70-200 doesn't quite have the same reach, but actually becomes a better general use lens on the 5D Mark II.
What I really want to see is a 24-105 (or even a 17-105) F2.8L IS. F4 is just a tad too slow for my liking...and I definitely want IS on the lens when shooting video on the Mark II.