>>4442046Zooms:
Pentax 18-135mm.
Pentax 28-105mm.
Primes:
Pentax Limited DA 21mm, 40mm for true pancakes
The Limited DA 35mm is realistically compact enough
The Limited FA 43mm is realistically compact enough
I prefer to have both with me. I'll usually keep the 18-135mm or 28-105mm on my camera and a prime or two in my sling, usually a wide angle prime (e.g. FA 21mm or DA 15mm) and a normal versatile prime (e.g. FA 43mm or DA 35mm).
I don't care much about having pancakes, just appreciate lightweight and compact size. The Pentax Limited series suffice pretty well in this domain. Sigma's i series primes also are strong contenders.