I have a 5th Ave. I find the neck very comfy. Not as deep as I normally go for, but a nice width (1.72 in. or 43.7 mm). Scale and fretboard radius are typical for an acoustic. I've grown used to the medium jumbo frets on my electrics, so the Godin's frets feel a little small, but not a real problem. The edges of the neck are nicely finished, and it has a great feel to it. If you absolutely insist on a fat neck, it may not be the way to go, but I really like it.
EDIT: Epiphone Wildkat? I've heard good things, I don't know the neck thickness.
"Tragedy is when I cut my finger. Comedy is when you walk into an open sewer and die." --Mel Brooks