The best replacement for pentax k7 is k5.

The best alternatives to pentax k7 are rated as following:
★★★★★  k5
★★★  k20d
  pentax kr
  pentax k5
  pentax k20d

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Speaking about pentax k7, one probably shouldn't forget about manual lens.

Other search terms related to pentax k7 and their ratings are:
★★★★★ manual lens
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pentax k7
k5
k20d