Originally posted by Bunch I disregarded the consensus opinion and bought the 20-40 a few weeks ago. It's a lovely lens.
I kind of agonised over the same choice a couple of years back. The 16-85 and 20-40 were roughly similar in price. I got the Limited. I figured that I had plenty of versatility and centre sharpness already with the 18-135. The 16-85 offered the same kind of thing, with sharper corners and HD coatings. From 55mm up, I had that already with the 55-300 PLM. Wide angle was well covered with the 12-24. The 20-40 offered something different - that intangible Limited look. (Plus compactness, WR, HD and a lovely build.) It's not the sharpest lens I own, but it's sharp enough. It just offers, well, zing. Lovely colours and microcontrast I guess. I've since bought the HD version of the DA 15 Ltd and it produces the same kind of look and has similar qualities.
15, 20-40 and 55-300 PLM makes a fun kit. Or the DA 70 or FA 77 Ltd or DFA 100.
PS. I'd still take the 18-135 on a boat trip, with the 55-300 on another body. It's the classic situation where lens changes are to be minimised.