I am just getting started shooting the ZEN WA100 port with the M-9 to 18 zoom and I have not yet tried the Pany 7 to 14 or the 14 to 42 zoom. I would think the 14 to 42 would work very well, keep in mind that the dome will make both the wide and narrow ends of the lens wider. So far the dome is rendering sharp corners and it is very well made. I have used the Olympus 170 mm dome with the 4/3 9 to18 zoom on the Olympus E-3 DSLR and find the results from both domes to be equal.
The housing, camera, 9 to 18 zoom and gear with the Zen 100 dome are just slightly buoyant. With twin Inon Z-240 strobes, twin tray and eight inch arm sections the balance in salt water was as good as it gets. I could set the unit on the bottom without it drifting off in the current and still use it with one hand and have total control without fatigue to my wrist and forearm.
I have used the 9 to 18 and the 7 to 14 zooms underwater and have found the auto focus speed to be as good as with a DSLR. This is not the case with the Panasonic 45 macro which seems slow at best. The images are very high quality however and I am hoping the Olympus 50 macro when it arrives will be faster.
I am also using the Athena port adapter for the Olympus housing which allows the use of the Olympus, Athena and Inon ports for the Olympus, Seatool and Nexus DSLR housings. So far I have shot the 7 to 14 zoom with the 170 mm port and the 14 to 42 with the Athena port for the 35 mm macro DSLR lens.
The port adapter is well designed and has the same duel O-ring seals as the ZEN port and installes the same way. The ports then threat into the adapter and reduce the effort of making a port change. The adapter will retail for around $255.00 and may appeal to Olympus DSLR housing users who already own the 170 mm dome.
The ZEN WA100 port is by far the better choice if you don't already own the Olympus DSLR dome ports.
This Athena link,
http://www.athena-opt.com/PT-EP01.html has additional details.
Phil Rudin