The best replacement for 17 40mm is 16 35mm.

The best alternatives to 17 40mm are rated as following:
★★★★★  16 35mm
★★★  10 22mm
★★★  24 105mm
★★  24 70mm
★  17 85mm
★  17 55mm
★  tamron 17 50mm
★  ef s 17 85mm
  sigma 12 24mm
  24mm
  16 35mm ii
  35mm
  canon 15 85mm

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Speaking about 17 40mm, one probably shouldn't forget about 7d.

Other search terms related to 17 40mm and their ratings are:
★★★★★ 7d
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17 40mm
16 35mm
10 22mm