And another vote for the little voigt.
It's a fun lens. Simply using it is a pleasure, the manual focus thingy is not really an issue (especially when shooting landscapes, just set it at the infinity hard stop and be done with it...).
Resulting photo looks good too. f/3.5 to f/5 is not really the sharpest in the corner but it's manageable. f/5.6 to f/11, the lens is excellent across the frame.
On starry skies, it's not that good though. You'll get visible coma on the outer third of the image.
There's also a bit of CA from time to time, but that can be removed easily. Almost no flare though.
I've been playing with it for the last year or so and it's still one of my most used lens.
another vote here its a great lens
and it take 52mm filters the same as the 40 pancake which is
a) dirt cheap for high end B+W filters CPL and ND
b) smaller lighter and can be used on both lenses