The best replacement for ath m50 is m50s.

The best alternatives to ath m50 are rated as following:
★★★★★  m50s
★★★★  dt770
★★★★  sennheiser hd 598
★★★  bose qc15
★★★  bose ae2
★★  akg k550
★★  mdr v6
★★  sennheiser hd 280 pro
★★  shure 840
★★  ath m50s
★  momentum
★  sennheiser momentum
★  hd598
★  grado sr80
★  ad700
★  shure srh440
  akg k240
  ath m50x
  k240
  beats studio
  dt880
  dr dre studio

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Speaking about ath m50, one probably shouldn't forget about fiio e17.

Other search terms related to ath m50 and their ratings are:
★★★★★ fiio e17
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m50s
dt770