Very exciting race indeed.
The Incident and subsequent penalty is borderline, but after replaying it several times I think the verdict is just (just) although the penalty seems a little harsh, the precedent of a drive-through penalty (i.e. 25 sec) for this type of incident has been set in the past, rather than a 10 place penalty for the next race which might have seemed a fairer one.
The 2 things that swung it for me is:
1) Hamilton clearly makes a concious decision to cut the chicane (a hard left on the steering) instead of making it around, which it looks like he could easily have achieved.
2) He does not appear to lift off afterwards in order to give his place back. I.e Kimi repasses Hamilton due to his superior straight line speed alone. Hamilton has therefore not properly relinquished the place/advantage gained through deliberately cutting the chicane.
Deliberately cutting chicane when he could have made it through to great advantage
Not lifting off afterwards (and clearly does hard left on steering)