"He can see things before they happen. That's why he appears to have such quick reflexes. It's a Jedi trait."
That's in regards to a kid who doesn't know what he's doing. Now apply that notion to actual, trained Jedi. These guys are countering moves the other hasn't even thrown yet. They're steps ahead in dreamy Force world versus the actual physical movement. Also why I love the Ani/Obi fight in III. These guys KNOW each others tricks inside and out, and they're still playing that game on top of that. It's an absolute mind ****.
Versus the original trilogy where you had Luke, who was kinda sorta trained but not like he would have been in the old days (not to mention the scant amount of time he actually had to train)... and old men, one of whom suffers from severe physical duress. Yeah, there's going to be a difference in the fighting style.