The best replacement for 5d is 7d.

The best alternatives to 5d are rated as following:
★★★★★  7d
★★★★  60d
★★★  6d
★★★  5d mark ii
★★★  50d
★★★  40d
★★  d700
★★  t3i
★★  1d
★★  70d
★★  d800
★  7d for video
★  t2i
★  black magic
★  6d for video
★  nikon d200
★  d300
★  d7000
★  7d video
★  30d
★  6d video
★  20d
★  blackmagic
★  7d canon
★  nikon d700
★  7d for film
  nikon d300
  canon 7d
  1ds
  d200
  nikon d800
  gh4
  d3
  t4i
  c300
  nikon d7000
  c100
  af100
  550d
  xsi
  1d mark ii
  canon 30d
  gh3
  t1i
  canon 5d mark ii
  gh2
  60d for video
  canon 40d
  600d
  nikon d2x
  5d mkii
  canon 1ds
  medium format
  40d canon
  sony a100
  d2x
  1d mark iii

Your alternative for 5d is not listed? Suggest!
Speaking about 5d, one probably shouldn't forget about 50mm 1.4.

Other search terms related to 5d and their ratings are:
★★★★★ 50mm 1.4
★★★★★ pl mount
★★★★ 17-40
★★★ 50mm 1.8
★★★ 24-105
★★ efs lens
★★ 24 105
★ twixtor
★ rode mic
★ 17 40
★ 50mm
★ fd lens
steadicam
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Google Trends

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5d
7d
60d