The best replacement for komplete 8 is omnisphere.

The best alternatives to komplete 8 are rated as following:
★★★★★  omnisphere
★★★★  komplete 9
★★★★  reason 6
★★★  komplete 9 ultimate
★  ableton suite
★  komplete 7
★  kontakt 5
  reason 6.5

Your alternative for komplete 8 is not listed? Suggest!
Speaking about komplete 8, one probably shouldn't forget about maschine.

Other search terms related to komplete 8 and their ratings are:
★★★★★ maschine
★★ kore 2
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komplete 8
omnisphere
komplete 9