DJE, I'd take the M28/2.0. I recently acquired the K30/2.8 and like what results I have seen, but the M28/2.0 seems just as good to me. Mind you, I haven't done any formal testing, but the M28/2.0 seems to be as good as any wide Pentax makes from the K28/3.5 to the K30/2.8 or either 24/2.8. I've never had a K28/2.0, but don't think much of the big, clunky design. Take the M28/2.0 and be happy with those 49mm filters. England is dark and wet anyway... ;-)
Regards, Bob S. DJE wrote: >>... I can't decide between my K30 and the M28/2 that I unexpectedly stumbled across too cheap to resist. I haven't shot much with either lens and I'm not sure I'm going to get much of a chance to shoot with them before next year's planned trip to England, so I figured I'd ask for advice.