When digital projectors were first installed in theatres about ten years ago they had 2K resolution, which is a 2048 x 1080 digital imaging chip. Later, SONY introduced a 4K (4096 x 2160) digital cinema projector in an attempt to differentiate their products. The other manufacturers eventually matched SONY with 4K projectors of their own. Most cinema auditoriums today have 2K projectors because those were installed before 4K was available.
In practice this resolution difference should not matter to the audience because you can't see the difference in resolution unless the screen is at least 60ft. wide which most are not.
There are several styles of Imax theatres. Most of these have been upgraded from film to digital in the last few years. IMAX uses dual digital projectors, each with 2K resolution. They claim that this is equivalent to 4K resolution but it really is not. It is still 2K but twice as bright.
The real advantage of a true Imax theatre is the size of the screen and design of the auditorium that allows most viewers to sit close to the screen. But most IMAX auditoriums do not offer this design; they are repurposed standard multiplex auditoriums with a slightly larger screen.
A big screen is, in my opinion, a much more important improvement for the audience than increased resolution. My advice is to not look for a 4K theatre but to look for an auditorium with a very large screen such as a true Imax or the equivalent premium theatres such as XD
from Cinemark, RPX from Regal or ETX from AMC.
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