Originally posted by JonPB If I were to buy the 21, it wouldn't be because it is exciting. "Reliable" would be the word. It would be the lens that I put on my camera when I don't expect to take pictures, so it would be there when I need it. Small and light. Wide enough to get most any ordinary image. Sharp enough to allow substantial crops for snapshots. Image quality that needs no apologies. Complements the 15 (which requires careful composition because it is so wide), and the narrower 40 and 70 (which often disallow the full context of a scene from being in the image). Easier to carry than even the kit zoom, not to mention f/2.8 zooms. Probably not a lens you'd look at a scene and think, "now, what this picture calls for is the 21." But you'd look at pictures taken with the 21 and think, "I'm sure glad I had that kit with me."
Exciting, no. But if I owned all of the Limited lenses, I'd bet that my 21 would have the most wear marks on it. And that'd be a mark of pride.
I should get one.
I almost forgot to mention something. The 31 mm ltd is a very expensive lens. However, there is an alternative, the Sigma 30 mm f 1.4. This lens is seriously fast for low-light situations, with excellent image quality. I bought my copy new, on sale, from B&H, and have not regretted it at all. I purchased this lens, frankly, to see if I could reduce my LBA which was directed at the 31 mm ltd, and to some extent it has done that. You can likely find copies in the range of $375 to $500 depending on whether you are buying new or used. The lens constantly surprises in low-light situations, and when hitched to the 5II would no doubt do even better.
Attached are four images, taken just today in Green Mode, using the Sigma 30 mm f 1.4. (Yes, I know I am the only person who admits using Green Mode!) All were ambient light, and the shot of my son-in-law watching Jacky Chan movie is low light. Obviously, a competent photographer could have done much better! CORRECTION: I just checked the EXIF data, and the third photo with mother and daughter was taken with flash, with some blown highlights on face.