A little spreadsheet with the figures for a heads up comparo.
As a person that has owned all four here is my take:
2011 Corvette Z06 - Felt the most nimble and "light" if you know what I mean
2012 Corvette GS - Pretender. I had a vert and although it was beautiful it did not stack up to the others
2012 ZR1 - Fast and did things well. Still the best band for 100k
2014 Stingray - Pure Awesome. Best looking, Best Ride, Best all around feel - The ZR1 vs Stingray to me is a toss up. If I had 570 to 600 rwhp in the Stingray it would be the hands down winner
.....but guess you knew that