Always a difficult question since if you put any PL player today in a time machine and send them to the 1980s, they would absolutely destroy any opponent. Makes it all a bit wonky to compare.
Why do people always do it this way round. If you took a skillful 70s/80s player and subjected him to a modern training regime/diet/preparation and put him on a modern pitch - he'd be a super-fit skillful player. And if Salah or Vardy had to cope with Chopper Harris or Norman Hunter kicking lumps out of them, they wouldn't be so effective.
The idea that Ashley Barnes, say, is a better player than George Best is ludicrous.