The best replacement for f2.8 is f4.

The best alternatives to f2.8 are rated as following:
★★★★★  f4
★★★★★  f3.5
★★  f1.8
★★  f4.5
★  f1.4
★  canon 70 200 f2.8
★  70 200 f4
★  f2.0
★  f2
★  sigma 70 200 f2.8
★  tamron 70-200 f2.8
★  17 40 f4
★  f 22
★  sigma 70-200 f2.8
  f4.0
  f4 bokeh
  24-120 f4
  nikon 17 55 f2.8
  300mm f4
  tokina 12-24 f4
  canon 50 f1.8
  28 70mm f2.8

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f2.8
f4
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