OK, here is the real road map
At the onset of pentax DSLRs they were promoted as compatible with 23million lenses made by pentax and countless other third party lenses. As I only have 45 in total, I am about 22,999,955 lenses behind.
seriously though
If you consider my 3 main kits, M42, K&KA mount MF, and then my AF zooms, here is where I sit presently.
M42 lenses
16/2.8 FE, 24/2.5, 28/2.5, 35/2, 50/1.4, 50/4 macro. 55/1.8, 58/2, 85/1.9, 105/2.8, 135/2.8, 135/3.5, 200/3.5, 200/4
K& KA lenses
8/3.5 FE. 14/2.8, 24/2, 28/2, 28/2.5, 2x28/2.8, 35/2, 50/1.4, 85/1.4, 100/4 macro, 105/2.8, 135/2.5, 300/4, 400/5.6, 1000/11(mirror) plus 70-210/3.5 and 200-500/5.6 zooms
AF zooms
10-20/4-5.6, 28-75/2.8, 70-200/2.8 plus 1.4x and 2x TCs.
incidentals DA 16-55, FA 28-80PZ and FA 28-108 PZ
Really what else do I need???
Honestly, something in the 19-20mm range in both M42 and K mount, just to have, and a 200/2.5 in k mount.
The only other thing I might entertain is the new 560/5.6