one additional thing to consider now that you are expanding your lens collection is where you may be headed overall.
My own opinion, and I have posted it many times, is that you need to consider covering a range of focal lengths from 10-12 mm at the short end up to 135-200mm at the long end.
The decision of 135-200 is a function of whether you shoot wild life to some extent, as well as whether you are going to get a long tele like a 300F4 or use the 70-200 with teleconverters etc.
the other condition I think is important is that you should cover this range with zooms first, with as much of the range as possible at F2.8.
This can be done with 3-4 lenses. If I stay entirely within pentax, you can get a 12-24, the 16-50F2.8 and the 50-135F2.8. If you need extra reach you can add the 300F4.
My base kit is made up differently, I cover a wider range with 4 zooms, and 2 teleconverters. I have a sigma APO 10-20 f4-5.6 EX DC, a SMC FA-J 18=35 F4.-5.6, a tamron 28-75 F2.89 and sigma APO 70-200F2.8 EX plus sigma's 1.4x and 2x TCs.
If I want to cut lenses out, the first to go is the 18-35 and if I am city bound I will drop the 70-200F2.8 and the TCs in place of either an 85mmF1.4(with SMC-F 1.7x af TC) or 135mmF2.5.
I find the 85 and 135 both excellent lenses to have in a city environment for tight framed shots and casual portraits, and much much lighter than the 70-200F2.8.
How you build your kit is up to you, but ideally all of the peices shoudl fit together to cover the range.
Primes are great, generally much faster than zooms and sharper, and lighter. but zooms are more flexible. In my view you need both, primes are more specific use, zooms are general use.
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