[toni-a]

A quitter's strategy, I'm not sure is a good advice.

And Pentax already have a very good 28-105 f/3.5-5.6, and a high quality 150-450mm f/4.5-5.6. What they lack are ultra wide D FA primes.

They lack an ulrawide and a 24-105 or believe me 24-105f4 is way more useful than 28-105 f4-5.6 Canon has even better 28-105f3.5-4.5 who is interested in it?
An appealing standard zoom is IMHO the first thing to start with. Regardless of the optical quality of the actual zoom it's range and speed aren't appealing.