I have a somewhat less-than-perfect Hektor as well, and find it to be a pretty good performer overall.
I seem to like third-party Leica screw-mount lenses for my Bessa R. My favorites are the A. Schacht Travenars, but I also have most of the Canons and some others, such as Kyoei, Steinheil, and of course one genuine Leica lens, the Hektor.
I put together a small comparison webpage and force my wife to be my victim if you'd like to see some comparisons. I haven't updated it in awhile, but you'll get the idea.
By the way, I'm new here. Usually hang out at RangeFinderForum.com, but this place looks nice too, so I thought I'd stop by.