The best replacement for af100 is fs100.

The best alternatives to af100 are rated as following:
★★★★★  fs100
★★★★★  gh2
★★★★★  5d
★★★★  c100
★★★  f3
★★★  gh3
★★  af100a
★★  af101
★  ex3
★  af105
★  fs700
★  ex1
★  hpx250
★  hvx200
★  hpx170
★  sony fs100
  gh2 hacked
  sony f3
  canon c100
  ex1r

Your alternative for af100 is not listed? Suggest!
Speaking about af100, one probably shouldn't forget about atomos samurai.

Other search terms related to af100 and their ratings are:
★★★★★ atomos samurai
You have in mind a companion for af100 and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of af100 in all years. Click on graph for more.
af100
fs100
gh2