When it comes to non-telephoto primes, the L lenses are generally worse than their non-L counterparts. The main advantage of the 85L is the f/1.2 stop, not the optical performance. L lenses tend to be "extreme" lens designs with many more aberrations as a result. If you've ever looked at shots from the 24 f/2.8 vs the 24L, you'll see what I mean. All the short Ls suffer from heavy chromatic aberration / lateral fringing, and overall image weirdness.
I say all this not to dis L lenses (I own a couple), but to underscore the difference between the DSLR and LF. The 50L at f/1.2 may give you the same ballpark shallow DOF "look" as 8x10 with a 300mm process lens at f/9, but the DSLR shot will have all kinds of wonky aberrations, whereas the 8x10 will have an unbelievably objective "no-comment" neutrality. You can get the same neutrality on a DSLR by shooting with a flat-field macro lens, but you will lose the shallow DOF.
That is the reason why I love LF. But honestly, LF is so cheap that you might as well just buy a system and try it yourself. You can get an entire 4x5 or 8x10 outfit for less than the price of a cheap EF lens. I saw a 4x5 monorail with lens on CL for $150 recently, and an entire 8x10 getup with lens, camera, tripod and 10 film holders for $500. And unlike digital gear, which depreciates faster than seafood, LF gear has great resale value if you decide to ditch it.
Bookmarks