I have both the original version (with the DLCs and all the updates) and my newly purchased Legendary that I have on the other PS3 in my house.
Now that 1.9 is uploaded on the old version with the DLCs I don't have as many issues with the frame rate as I did previously.
The only difference I've noticed is that the Legendary doesn't seem to randomize the world encounters if you start each new character from a pre-saved load (as opposed to New Game) as my older version does (by presaved I mean in Helgen, say, after the ride in the cart but before character creation). The Legendary seems to have the same encounter sequence over and over. It's the same sequence with the only variation being due to character type and ability use (i.e. mage vs. warrior). It's not an issue if you do "New Game" each time though. Haven't really noticed any frame rate change between the two though although the DLC integration is a bit more seamless. Same old bugs though (especially the 1/2 buried people & animals and the dissappearing daedric artifacts).
