Upload & Sell: Off
Hmm, this is kind of tough considering I'm only attached to two systems and not much of an alt shooter...
Current: 70-200/4 L IS - It's probably my most used lens on this system now that most of my 50mm and wider work is done with Leica. When it was released it was a definite optical improvement over the f/2.8 IS version of the time. Sharper, faster, more precise AF, better contrast, better handling of backlit situations, better IS, and way smaller and lighter. Haven't often missed having f/2.8. Haven't missed the size and weight.
Future: 200-400/4 L IS with built-in 1.4x TC. If this lens lives up to the hype and Canon doesn't price it out of the stratosphere (latest rumor is $15K US ), it will be my only 200mm + lens, replacing the 300/4 IS, 400/2.8 IS and 600/4 IS.
I don't shoot any alts on my Canon system because I wanted to downsize, hence the partial transition to the Leica M9, and that's where my money has gone over the last couple years:
Current: 21 Lux - There are other better (sharper, higher contrast) lenses at this and other focal lengths, from Leica, and others, but it's still a unique lens when desiring subject/background isolation wide open (CV21/1.8 is close, but noticeably not as dramatic). Otherwise I'd probably vote for the 21 SEM - small, super high resolution with great contrast and color.
Voigtlander 21/1.8 - Probably the best all-round 21mm M series lens for the combination of speed, sharpness (once stopped down a bit, though centrally very good at close distances) and price.
Voigtlander 12/5.6 LTM - very small with quite good performance, and not too expensive either. Included because it's LTM. IMO, they ruined it with the huge hood design when switching to M mount and also dropping the 30cm minimum focusing distance.
Nikkor 5cm f/1.4 LTM - a nice Sonnar lens with character wide open.
On the wish list:
Zeiss ZM85/2 - I've used enough to know it's really nice! Also easy to focus.
ZM35/1.4 - supposed to arrive this year - what characteristics will it have?