rent then purchase if you like. its more a long the lines of a one time watch or few times a decade unless its to show off the film to people since its a trip.
film was shot entirely on iphone 7 ... so unless the 4k version is price comparable, the blu-ray would do just fine in this instance. Some would say its probably the worst ultra hd blu-ray release PQ wise ... but its actually the directors vision for film to have that look ... so with that in mind it is what it is so then its hard to knock it for that. Kinda like when other directors use a sepia tone etc. they made it look like that on purpose.