There'd be a few that probably deserve to be on this list that aren't simply because I haven't seen them.
Runner up films in no particular order
Guardians of the Galaxy
X-Men: Days of Future Past
Dawn of the Planet of the Apes
Anyway, my top 5:5: The Grand Budapest Hotel
the Society Of The Crossed Keys montage may not have been the strongest scene of the film, but was just delivered so well by so many cameos it stands out to me personally.
Runner up scene: The prison escape.
3: John Wick
The Aquarium/Water Filter carriage. The brief pause in the action as they stop to discuss the delicate balance of the train's ecosystem (totally estranged by the nightclub car and sauna carriages later) was stunningly presented and very well delivered. Plus who can resist that awesome-looking sushi?
Runner up scene: The Classroom
2: Why Don't You Play in Hell?
Without a doubt; John's rampage through "The Red Circle" nightclub outshines even the previous title-holder of 'Best nightclub shootout' held by Collateral for a solid 10 years. It's quick, it's brutal and it's so well-choreographed that you lose yourself in how stylish it all is.
Runner up scene: The hotel room's assassination attempt
While a 2013 film, it still works it's way into my list because I only saw it this year and it was incredible.
1: The Raid 2: Berandal
The entire action sequence at the end of this film was just one long rampage of violence and hilarity that brings the whole film to it's inevitable conclusion, dashing any hopes of there being the happy ending you expect with tales like this (which is even touched upon with the daydream beach sequence prior). Picking one moment from it would be like picking your favourite bit of pork from a big bowl of delicious ramen, it's all good.
Runner up scene: Mitsuko hunting down the former boyfriend and delivering the final goodbye kiss.
EFHRK's hit the nail on the head, just like WDYPIH's final sequence, the action scenes that lead to the final closing to the movie where Rama fights his way through gang members and assassins alike to reach the building's dining hall is just one long series of brilliantly choreographed fights that demonstrate that special effects just can't beat the style of this caliber.
Runner up scene: The car chase before the penultimate scene mentioned also merits high accolades for achieving so many brilliant stunts and sequences worthy of a Mad Max 2 seal of approval.
Runner up runner up scene: Because I can't get enough of this movie, it's a tie between the brawl in the muddy prison yard and Mad Dog's fight in the dance club/death in the snowy alley.