You must have exceptionally good eyesight. For someone with 20/20 vision, 5k is the limit of resolvability for a 90 degree angle of view. A typical cinema configuration gives an angle of view of between 45 and 60 degrees in most seats.
Going beyond 4k in digital cinema projection will have some benefits, but they won't be perceivable by the majority of people in the majority of seats. In the extreme case, someone with perfect eyesight sat on the front row can see up to about 11k.
A far bigger issue is the deprofessionalisation of projection. The overwhelming majority of cinemas no longer have a fully trained projectionist. As a result, serious errors in projection are commonplace. There's a huge amount that can go wrong between the DCP and the screen; without a trained person in the projection booth, it's left to the patrons to notice if a film is being projected out of focus, in the wrong aspect ratio or at the wrong brightness.
Going beyond 4k in digital cinema projection will have some benefits, but they won't be perceivable by the majority of people in the majority of seats. In the extreme case, someone with perfect eyesight sat on the front row can see up to about 11k.
A far bigger issue is the deprofessionalisation of projection. The overwhelming majority of cinemas no longer have a fully trained projectionist. As a result, serious errors in projection are commonplace. There's a huge amount that can go wrong between the DCP and the screen; without a trained person in the projection booth, it's left to the patrons to notice if a film is being projected out of focus, in the wrong aspect ratio or at the wrong brightness.