Comp Carbon frame is same as S-Works. I think the purple finish is amazing. $3500 can buy a bit of upgraded components. Sell the stock stuff. Better warranty coverage for original owner. Used bike has a 2 year warranty from date of the original purchase (when the original owner bought the bike). I guess you would need some kind of documentation for that.
"If you're the second, or later, owner of a Specialized or Roval product, you are eligible for a two-year warranty from the date of the original retail purchase. "
I thought I was going to upgrade the 34 performance fork right away, but I've been impressed by how well it actually works. Will probably eventually get a 36 Factory Grip 2 when my b-day rolls around, but the 34 has been fine. I'm a trail rider, not doing 20 ft gaps, 6 foot drop to flats, but I do ride in the mountains, lots of rocky technical, high speed trails here in NM. Plenty of elevation gain and loss.
I've also been a Shimano fanboy for a number of years, but the G2 RSC brakes are fantastic. More power and modulation than my previous 4 piston XT's. The Sram eagle drivetrain is adequate, but I miss the XT 12spd I sold with my Hightower 2. Much more refined.