I'm just going to reinforce my personal desire for more attention to the S-Pro line:
- Some sort of fast, UWA zoom - starting at 12 or 14mm, F2.8. Something to compete with the Sigma 14-24 DG DN Art. I'd personally prefer a 14-24.
- Second-generation versions of the 24-70 F2.8 & 70-200 F2.8. The current lenses are known to be spectacular, but they are heavy - very heavy. And thus not competitive with the latest from Canon, Sony, etc. And no, those lighter competitive lenses don't seem to give up anything from an IQ perspective, but they are pricey. And the new Sigma 70-200 is quite good, but it's both heavier and less resolving than Sony's latest. So, the Sigma is a great lower price option, but right now L-mount doesn't have an answer for the very best 70-200s out there on the market.
For those that say "Why not use Sigma?" My main reason is that the direction of the focus barrel is the opposite of Panasonic's, and I'm a creature of habit. I want to go either all-Panasonic for my zooms, or all-Sigma. And right now I'd rather go Panasonic for zooms, for various reasons, with the main reason being the excellent 24-105 F4. There is nothing else like it in L-mount, and I build my zoom/hiking kit around it. And, somewhat ironically (for me), the 28-200. Again, there is nothing like it. So, I'm married to those two zooms, and I want the rest of my zoom barrels to twist the same direction.
I sincerely hope that with the new S1RII coming out, Panasonic tasks it's lens team to refreshing the S-Pro zooms. We have a great selection of competitive light/compact zooms and primes in L-mount right now. So let's see those new flagship zooms!
And yeah, a few more S-Pro prime would be great, although there I don't have as much a problem going Sigma there. In fact, with my sub-genre of astro, I think Sigma is hitting it out of the park with their current primes.