SithLord822,
Wow, a challenge. A line-up of 4 helmets is a little hard on the eyes and requires photos of the same photographic angles and distances. The problem is, despite my Google search, all I can find are rough similarities, so your mileage will vary when it comes to comparative value.
Well, first, let me do a structural study of the eFX vs Quasimodo 2 first. The camera is closer to the eFX than it was to Quasi, so it looks like it has a bigger face than Quasi, so please note the false positive. This is more a comparison of aesthetic balance and dome shape:
Just to me personally, the eFX ANH dome warpage never really appealed to me, but from certain angles it can look good.
Now the comp you asked for. And again, note that everything is oriented differently:
(Left to right: eFX, Quasimodo V2, SL and GH ANH)
Now first, I need to be impartial and explain a few things. In addition to the discrepancies of the orientations, angles and camera distances, the lighting angle and paint finish are different on all helmets, so each will have their different appearances, so some strengths and weaknesses will be apparent and will vary. The GH ANH has unfortunately been bashed for its massively pulled-out neck, but there are indeed castings that have a narrower and more accurate neck, and these don't get as much attention (but photos of these, especially of a forward-facing direction, are hard to find).
The flaring and warpage of the eFX was covered previously. The SL here is an SL casting and not the original SL, and it was previously pointed out by someone that the SL dome casting had too much flare, but my personal take is that the sides of the domecap appear too compressed, but sometimes it's hard to tell from photos, as rotating a dome to either side by merely a few millimeters can alter profile perceptions significantly. Finally, the GH ANH dome orientation should be noted as different than the first three helmets.
Enjoy. Comments welcome!