I'm fairly new to L-mount. I bought a lightly used S5 last Nov and now have a few lenses with it - the TTArtisan 11mm f2.8 fisheye, the 20-60, 24-105, and the 50/1.8. I've also got a pre-order in for the 14-28. I'm a pure photographer (no video) and mostly do landscapes, so the S5 is actually enough for me. I don't need the improved PD autofocus or the faster 30fps burst rate. However, the new EVF would be nice to have and according to the video review of the S5ii by Richard Wong above, it does seem that the raw files from the S5ii have notably better highlight recovery headroom, so I'm sort of tempted. Maybe if I sell what's left of my Olympus gear I might get one and run the S5 as the backup camera.
EIther way, I really hope that the S5ii sells like hotcakes and that L-mount breaks through to be at least as popular as Nikon, Canon, and Sony. Is the FF mirrorless marketplace big enough for four major players? Let's hope so because I can't see any of the others giving up anytime soon!