Just an FYI...
If you go "off-brand" with your lenses and for some odd reason you turn up an IQ (or other) question, "official" Pentax will not be able to help you troubleshoot the issue. They can only help if you have Pentax gear.
Also, I'm quite happy with my 'go to' lens selection. I have other lenses that can be considered exotic and are neat to use, but when it's time to get serious, it's 'go to...' .
Best of success...