So me playing a 6 on my 40 inch isn't going to feel like a 6 for you guys playing on a 30 inch TV, it's going to feel much faster
Mainly the correlation I'm trying to find is what a good KDR is in comparison to someones aim sensitivity
I don't think there is really a correlation. 2 or 3 of the better guys I know 2.5+ K/D play on 2-3. Also, screen size varies (as you know), but it's also important to take into account distance from that screen (not everyone sits exactly 6 feet from their screen, no matter what size). A guy sitting 20 feet from a 47" TV will probably have a worse view than a guy sitting 3 feet from a 21" monitor. A guy sitting 3 feet from his 21" monitor could have just the same view as a guy sitting 8 feet from his 47", etc.