I picked up a Takumar Bayonet 135mm (non-SMC) when I was inexperienced and soon realised why I got it for a seemingly good price.. Finally getting around to selling that now!
I'd also part with my original 18-55 kit lens with no regrets at all, I'll get rid of it as soon as I pick up a WR version (which at least has a use in my collection).
I haven't used my A 50mm f1.7 since I got the M 50mm f1.4. A is useful, but I really only want them for the DOF so the M gets used and the A doesn't. My DA40 works better as a general purpose lens.
I wouldn't lose any sleep over ditching the M 28mm f2.8 either. I used it for 'single in april' and every shot needed work in lightroom to make it presentable, matched with the K-5 it's kinda murky.
Originally posted by PALADIN85020 I could only pack one lens on the excursion
That's quite confusing to read, from a Pentax user! You may need a DA21 or DA40 to keep in your pocket at all times.