Since I've had the M50 1.7 from new (bundled with my still active MX) - I think that lens wins the right for first shot on another new camera, 37 years on... (It was relegated to 2nd turn when I got the K5 with 18-135).
Then:
F28 2.8
F50 1.4
DA* 200 2.8
Sigma 105 2.8 Macro
Sigma 15 2.8 FE
Sigma 10-20 3.5 with Pentax HD 1.4x
Then other FF and APS-C zooms in no particular order.
The subject may well be the dog - if he cooperates :-p
PS It makes me realise that:
- I have too many lens
- The relative lack of WR or AW primes in the current Pentax lens lineup or roadmap
- I still don't have enough lens