Once Upon a Time in Hollywood ★★★★½

A slow build and feels a little unsure of what it even is itself for the first act, then steps up brilliantly, and finishing with a beyond tremendous third & final climatic act being one of the most enjoyable i can remember.
I fear reservoir dogs may be hoisted from its no.1 and 5^ platitude by myself after another watch or 2. 
Was just dreamy watching and felt like a true bystander to all that was happening throughout. 
A lot of brilliant nods; some subtle some much less so; to his other works too.