"A high percentage of people"? C'mon, define some parameters here to back up this massive claim.
My sigmalux is consistent - sounds as consistent at misfocusing as your 50L.
Agreed!!! there are just as many 50Ls/85Ls/SigmaLuxs/etc for sale at any given time as any other lens...just because people sell something doesnt mean the gear they sell is ****! I guess the 5D2 is **** because so many people are selling them lately? OR, maybe people are just upgrading to the Mark III, or are getting out of the 5D2 right now while the gettin' is good before the price drops to the floor at the end of this year with Photokina and year end sales on the MarkIII/etc..that is what I did..dont regret it at all..
BACK to the OP(I tend to ramble. sorry )
I LOVE my Sigma, it is PERFECT on ALL of my bodies EXCEPT the 5D2(which is the only one that has MA!)..got rid of the 5D2 for a 1Ds2 and 1D2n and the 50 is deadly accurate on both.
And the BOKEH is creamy/dreamy and ALMOST as good as the 50L.
The only reason I will be buying a 50L someday is for that extra bit of sharpness wide open...where the Sigma SOMETIMES faults. but, at ++3-4x the cost of the Sigma, I may have a lot of convincing to do to myself as I cannot find a single thing wrong with the Sigma. I love it just as much as the 70-200IS II I had. It lives on my FF camera as I know it just works.
I have owned 2(maybe 3) Sigma 50s over the past three or four years I think..only one needed to go in for calibration. IMHO, the Sigma 50 has LESS AF issues than most of Sigma's other lenses...especially their zooms(atleast every F/2.8 zoom they make/I have used has been inconsistant)
If you find a good Sigma, it has been my experience that they tend to rival the comparable L lens. Sigma makes a good lens. especially for us that do not make a ton of $ in this business(yet), or hobbyists..