IMO KM feels more or less like a revamped SS set by taking out Handclap and putting in a blaster NRG torrent. Here's a comparative of attack powers, disregarding order for KM set from Mid's:
Brute SS:
Jab 1.07s 28.4
Punch 1.2s 41.7
Haymaker 1.5s 68.4
Handclap (No KM equivalent, replaced with Energy Torrent)
Knockout BLow 2.23s 148.5
Hurl 2.5s 68.4
Footstomp 2.5s 68.4
Brute KM:
Quick Strike 0.83s 35
Body Blow 1.07s 48.4
Smashing Blow 1.2s 61.7
Concentrated Strike 2.83s 148.5
Focused Burst 2.0s 68.4
Burst 2.67s 52.1
Repulsing Torrent 2.0s 33.0
Blaster NRG:
Energy Torrent 1.07s 60.1* (blaster dmg scale)
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Quick Strike - Casts 0.24s faster than Jab, and deals 6.6 more damage.
Body Blow - Casts 0.13s faster than Punch, and dealing 6.7 more damage.
Smashing Blow - Casts 0.3s faster than Haymaker, but does 6.7 less damage.
Concentrated Strike - Cast takes 0.6s longer than Knockout Blow, damage is the same.
Burst - Cast takes 0.17s longer than Foot Stomp, and deals 16.3 less damage.
Repulsing Torrent - Cast takes 0.93s longer than Energy Torrent, no comparison on damage (I don't remember Blaster -> Brute damage conversion off the top of my head).
So yeah, just a simple comparison that doesn't take Rage and Power Siphon into account, but it shows you the similarities between the two power sets. It also shows that KM's first 2 attacks are hands down better than SS, but the set begins to balance starting from Smashing Blow by dealing less damage, taking longer to cast, or a combination of both.
I'm still leveling my KM/SD though, and it'll take a while before I can really make a good judgement on the set.
you haven't watched the Street Fighter V