Thank you all for the fantastic information.
I think I understand most of it, but am taking to task to research more based on what I see here.
I'm planning to get two lenses here in the near future.
I'm going to first, get the 70-200 f/2.8 L IS USM II.
I think I'm going to put the 50L on my list for the next one...
I've been following on Creative Live this week, the talks by Sal Cincotta, with his excellent lectures all week on Wedding Photography, and been watching him use the 50L quite a bit, and the resulting pics he's been taking with it...well, some of them are stunning.
So, I'm going to make this my next prime. I need the zoom tele first (he also was shooting with the 70-200L a lot too)....and the next prime will be the 50L.
One question...is there rumor of a new version of the 50L in the works? I'm coming to the understanding that the current design, is getting a bit old....so, wondering if there is a new one coming out in the relatively near future?
Again, thank you all for the excellent information.
If anyone has real world reviews based on their ownership and use of the 50L, please, keep adding them onto this thread...very interesting reading, especially any methods or means you use to work around the focusing issues....