The best replacement for hx820 is hx729.

The best alternatives to hx820 are rated as following:
★★★★★  hx729
★★★★★  nx720
★★★★★  hx850
★★★  hx750
★★★  hx929
★★  hx925
★★  hx855
★  samsung series 8
  ex720

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hx820
hx729
nx720