I don't quite understand the debate, especially if you consider price vs performance. The FA50mm f1.4 is hands down the best lens going IMO for a number of reasons.
Now that being said, the A 50 f1.2 is a nicer lens but almost impossible to find. So unless you get very lucky at yard sale, forget it.
I've owned at least 10, 50's and even the old 'kit' versions are faster than almost any lens in other FL's. Admittedly I have never shot with the VL or Ziess versions.
-So the FA50 is sold around $200 at B&H and several other places. Can't beat that.
-The lens is almost as fast as available from anywhere and the 1.2 isn't really any faster in the real world.
-It's AF! That can't be ignored. Yes I like to manual focus once in awhile but AF has to be part of my kit because things just happen too fast sometimes to be figging around with a viewfinder that was never designed for heavy MF use.
-it's super sharp. Nope the limiteds are better but this lens always nips at the heals of the 77mm in all respects. Agree that wide open it's a tad softer but then the DOF is razor thin.
- Did I mention razor thin DOF? You can crop images from this lens and fool almost anyone that it was a 2:1 macro if the shot was taken correctly.
-49mm filter threads. How much money do you want to waste on good CPL's? Sticking to 2-3 filter sizes has it's benefits and can save money.
-SMC coating. We rarely discuss this factor but it's still considered one of if not the best in the business. I would say it's one of the 2 or 3 reasons that Pentax is still in business. Pentax built the business on glass.
Only weaknesses? Well it's not a VL/Zeiss or A* series when it comes to build quality. It's solid enough and the internal mechanism is metal with a plastic body. Second if you are determined to do a ton of MF work then this is not the best lens. In that case save $300 over the VL/Z and get a good used A SMC 50mm f1.4 IMO a waste of money to buy the VL/Z over the A 50mm f1.4 if MF is important.
Last edited by Peter Zack; 04-07-2008 at 05:02 PM.