Check out these gifs of various windups/swings from old time HOF players (or at least mostly HOF, I didn't check them all):
I can't help but think that most of these guys would be completely pwned in today's league, at least the hitters. It's harder to tell with the pitchers.
I mean, look at Ty Cobb's swing. He doesn't even have his hands gripping the bat together.
Walter Johnson, check out that follow-through:
Mel Ott - how slow must that pitch be coming in to have time to get a leg kick like that?
Just goes to show, these guys were dominant in their day, but the game itself has changed so much.