If you want to shoot with the sun in the frame, forget zooms, and get the DA15mm Limited and the DA21mm Limited. There are no lenses, anywhere, from anyone, more flare resistant than those two.
DA21:
DA15 a few minutes earlier
DA15 has a whole thread with 700 pages of photos:
The 15mm Limited controls my mind - club - Page 700 - PentaxForums.com
If I were setting up a Pentax kit from scratch with the 60-250 on the long end, I'd get the 15, 21, and maybe the 16-85 for middle-range walk around, or the Sigma 17-70 or 17-50/2.8 if you don't need WR. I would add the FA43 as a fast normal-ish prime. It's my favorite lens by a long way, but it's not a great landscaper.
In my personal opinion, Pentax's 2 great strengths as a brand are WR zoom lenses for reasonable cost, and the small Limited primes.
Last edited by Kozlok; 04-28-2017 at 05:55 AM.