I think that Spoondoolies is missing from that list. Granted they are pretty new - I'm fairly certain their numbers come close to AM.

Quote

Hash rates vary between 1.4 and 1.6TH depending on temperature, and power consumption between 1.1 and 1.3KW from the wall.

That's about 0.8 W/GH.

Does anybody know which vendors are able to deliver < 1 W/GH with current models?

At this point they are all below that level.
Cointerra has a 20nm at around .7W/GH that had started deliveries in January (TerraMinerIV).
(https://cointerra.com/cointerra-open-silicon-announce-tape-goldstrike1-asic/)
https://www.youtube.com/watch?v=uvVCISb9N14

KNC has a proven <1W/GH via Jupiters, and is expected to deliver the .51W/GH Neptune this month - Although I couldn't find actual stats this guy has a detailled post as to why:
http://forum.kncminer.com/forum/resellers-affilicates/general-questions/30886-neptune-will-probably-be-4-875gh-at-2-237w-here-s-why-and-what-to-expect

Those numbers are not exactly good. We went from friedcat claiming [.2 (low power) to .35W/GH] to external manufacturers delivering specs that are entirely different(.85W/GH). As a shareholder I would have liked to hear about it here first, and from a direct source.