Phil,
Thanks for the link and info on the Rokinon 8mm. In regards to size, I was actually referring to the Samyang line of lens that Deco369 was commenting on above. Their current lens are too wide for the mini-port system and I suspect the 10mm will be too. Unfortunately, as you said many of these lens are manual focus & aperture, so gears will be an issue.
If one already has the S20 and the VCLECU1 WA converter, it should perform fairly well in Port 4.33. The little barrel distortion I saw can easily be corrected in post and the resolution appears to be an improvement over the S16 by itself. Sony added some additional elements and did a much better job with it compared to the S16. As I said earlier, I got good results on resolution and corner sharpness when adding the Sony WA converter. It was a noticeable improvement over the S16, especially in the corners. Basically you get 20mm x .75 = 15mm lens. Just don't expect the same results when adding the VCLECF1 FE converter. I was going to post 100% blow-up of the corners, but lost interest and got busy doing other things. If anyone wants, I can dig them up and post them if they're interested.
I'm looking into using Photoshop's elliptical, unsharp mask, gradient and feathering tools to sharpen soft corners without affecting the center of the photo. The gradient and feathering tools can make the transition from the corners to the center less noticeable. I think it can be done in Lightroom 5 with the new radial filter too (providing one can invert the selection), but with less control than you have in CS6.
With Sony's continued adventure into e-mount, we should start seeing some new lens in 2014.
Fun

---------- Post added November 14th, 2013 at 11:17 PM ----------
PS. I see that Samyang makes a 8mm FE too that's only 60mm wide. Maybe the 10mm coming will be in the same design series and be just as narrow. If they can come up with an auto-aperture, perhaps Nauticam will make some focus gears for them. Nice that the NEX has focus peaking because focusing a FE sometimes can be rather difficult to get spot on looking at viewfinder under water.
---------- Post added November 14th, 2013 at 11:33 PM ----------
PSS. Okay, now I see Rokinon and Samyang are one and the same
