You believe all of the OT films are of the same quality?
First, quality is non-existent property when it comes to art (i.e. completely subjective things).
It’s nonexistent in the fact that it’s not something physically tangible but it exists in the mind and that is all that is pertinent for this conversation.
Quality of a product (and its properties) must be measurable, otherwise it is not quality. If it is measurable, it has to have an objective measure. Completely subjective things (like film) do not have an objective measure. There is no objective measure for properties such as story, acting, dialogue, music, sound, etc.
Second, I like them all equally.
SW and ESB I can understand because the have advantages over the other. SW is funnier, more visually interesting, has a catchier soundtrack and has the aura about it. It’s the epitome of classic Star Wars. ESB has a better written script, is better paced, has way better acting and dialogue.
On contrary, EBS is visually more interesting, while ANH has overall superior acting (there is just nothing in ESB remotely comparable to Cushing and Guinness). As for pacing, it is just a different approach. ESB is jumping slow-fast-slow-fast, while ANH is gradually progressing from very slow to very fast.
I don’t really consider ROTJ as being in the same league. At it’s best it exceeds a lot of moments that came before it but other aspects of the film leave a sour taste in my mouth.
Well you may not consider it, but it is.