Today heavyweights

Hello everyone.I know that this is the old theme about today heavyweight vs all time great.But i will not compare between them who was better or who would win.I will talk about passion.I just watched Fury-Chisora fight.And it was preety good fight.But for me there was no  excuse for bad phisical contition of Chisora.These comparition with pasr fighters is big fail of today fighters.This was in one way fight for challenging one of the Klitschkos.I don't remeber that any single contender in 50s,60s,70s,80s came not prepared for fight like that.Another example for me is Klitschko vs Haye.Two good havyweight with great phisical tools and good prepared but most of the fight in safe mode.After fight they were not tired and not because of their good phisical condition but because as i mentioned fighting in a safe mode.Compare this fight to Ali vs Frazier.Their gave their best,they was prepared to die in ring.After fight they were totaly exhausted.I know that life has changed today than 40,50 years ago and people are not ready to that kind of sacrifice but i also know that they receiving big paydays today.Don't get me wrong ,I love watching boxing and i admire all fighters but I just don't see passion of fighters like before.They just don't have that pride and dignity.