The best replacement for 24-70 is 24-105.

The best alternatives to 24-70 are rated as following:
★★★★★  24-105
★★★★  70-200
★★★  17-55
★★  24-105 canon
★★  24-120
★★  24-70 ii
★★  16-35
★★  28-75
★★  28-70
★  50mm
★  primes
★  28-70 nikon
★  85mm
★  50mm 1.4
★  24-105 f4
★  28-300
★  35mm
★  canon 24-70
★  24-85
  35 1.4
  nikon 24-70
  24-105 nikon
  24-100
  sigma 24-70
  17-55 nikon
  17-55 canon
  tamron 28-75
  canon 24-105
  16-35 nikon

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Speaking about 24-70, one probably shouldn't forget about 7d.

Other search terms related to 24-70 and their ratings are:
★★★★★ 7d
★★★★★ d800
★★★ d7000
★★ d600
★★ 60d
★★ d90
★ 5d mark ii
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