The best replacement for mamiya rb67 is hasselblad.

The best alternatives to mamiya rb67 are rated as following:
★★★★★  hasselblad
★★★  pentax 67
★★  bronica sq
★  bronica etrs
★  bronica
★  pentax 645
★  pentax 6x7
  hasselblad 500
  bronica gs-1
  hasselblad 500cm

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Speaking about mamiya rb67, one probably shouldn't forget about 6x6.

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mamiya rb67
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