Dunkirk was the first movie I ever saw on imax laser, earlier this year. While I’d love to be able to say that 70mm is definitively superior, I really can’t.
I still personally prefer film, but if I’m being totally honest, the dual 4K laser projection looked as good as any 70mm print I’ve seen. And according to articles I’ve read the industry professionals who’ve conducted direct comparison shootouts tend to agree.