The best replacement for sony a7 is a7r.

The best alternatives to sony a7 are rated as following:
★★★★★  a7r
★★★★  canon 6d
★★★★  nikon d610
★★  fuji x-t1
★★  nikon df
★★  olympus em1
★  fuji xt1
★  nikon d800
★  nikon d600
★  canon 70d
★  fuji x-e2
  em1
  omd em1
  fuji x100s
  leica m

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Speaking about sony a7, one probably shouldn't forget about nikon lenses.

Other search terms related to sony a7 and their ratings are:
★★★★★ nikon lenses
★★★★★ leica lenses
★★★★★ leica lens
★ canon flash
nikon lens
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sony a7
a7r
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