I think I want to try a sub 2.8 lens. I'm considering these options and would like to get some opinions on why one rather than the other, and one thing that is very important is will any of these lens resolve for the 21+ MPs cameras?
50mm 1.2L 1550.00US
50mm 1.4 360.00US
50mm 1.8 II 100.00US
85mm 1.2L II 1840.00US B&H sale!!
85mm 1.8 380.00US
Let's do this!
The only lens I don't have experience with above is the 50 1.2. The 85 1.2 is fantastic for anything not moving too swiftly, as people have mentioned, it's slow to focus.
You don't include the 35 f/1.4 in that group, but it's also a fantastic lens.
For my money, the 85 1.2 is the choice, and the prime lens from Canon I would most least like to give up, and the one which despite it's pain-in-the-butt size, I tend to carry around all the time.
That said, picking up the 85 1.8 and the 50 1.4 would save you a ton of coin, and let you play with two different focal lengths in low light and shallow DOF.
When I trave around with my prime-kit, I tend to have the 35 f/1.4, the 50 f/1.4, the 85 f/1.2 and the 135 f/2. I recently added a 14 f/2.8 to round out the set. The 24 f/1.4 gets left behind far too much, and as a result I'm likely going to sell it in the new year. The 100 f/2.8 macro has kind of made a come back for me in studio for portraits, so I leave that there now.
But you can do a lot worse than have a kit of 3-4 good to great primes. It saves a bunch of weight and space compaired to hiking around 70-200 and 24-70 zooms, and in some ways (low light/DOF) gives you greater flexibility.
B