The best replacement for cp4 is cp5.

The best alternatives to cp4 are rated as following:
★★★★★  cp5
★★★★★  rd800
★★★★  cp300
★★★  moxf8
★★  cp3
★★  rd-700nx
★★  cp40
★★  roland rd700nx
★  cp1
  kawai es7
  yamaha cp5
  kawai mp10
  kawai mp11

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cp4
cp5
rd800