Not sure where you are going with this, but, having owned a C2, C4, C5 and C6, I'll tell you that from a comfort point of view the C2 was the LEAST comfort. Although not stock, mine looked cool (done in 1975)
64 Coupe interior
C4s are a little tight in the footwells, but the seats were very comfortable. We made several trips where we were in the 94 for 8-11 hours in one day, and felt comfortable all day and fairly refreshed when we got out at the end.
94 Coupe interior
The C5 (2001 Coupe) interior is much more spacious,, everywhere...especially in the footwell. The dash covering might appear to be a bit 'cheap' but the seats are really comfy, and, even though I installed custom seat covers from Mid-America Motorworks,
New Seat Covers from Mid America Motorworks I think the interior is pretty good looking.
As far as the C6 goes Chevy improved upon the C5s' interior. When I went searching for "James" one requirement was the 2 tone Cashmere/black seat covers/interior. I've also added a few Atomic Orange accents.
2007 Coupe interior