No load times at start, you don't even see the loading screen. Honestly only difference I've noticed.

I was initially upset after having downloaded the $20 DLC and finding out there was a PS5 specific version, but I'm justifying it with the fact i've played this game almost daily for years now. Transferring over the 3,000,000 save file was top 10 scariest moments in my life but was super easy, load up PS4 version, go to save files click Sync, click Upload. Go to PS5 version save files go to Sync, click Download. All progress came with, even the current run I was on was able to be continued.

Anyways, yeah it sucks to spend $80 for the game but I'm pretty sure over the next few years or so I'll get my moneys' worth.