Most films are indeed shot in this aspect, but this is *film* aspect.
Unless you are procuring reels for movie theaters and jamming them in your PC
- you are watching either DVD or BluRay remastered content (and most of online content comes from these sources too). And these are 16:9 which is still mainstream aspect for most TVs and monitors.
Btw some recent BluRays indeed come in 2.35 ratio, but this is deceptive - because they are not *expanding* the resolution, they are *shrinking* it vertically by letterboxing (since they still have to support playback on all old non-UW-aware players). While with proper player it will indeed fill the whole screen on UW monitor, it does not look that great since it just magnifies pixelization and compression artefacts.
2.35 as proper source digital content may gain more prevalence in the future, but it still in its infancy.
No such thing
I've tried hands-on Z35 myself, looked at 34" 1440p, but settled to XB321HK and its pretty good - but its not *epic* and still has some issues. Unfortunately with modern displays there is no killer tech and you just have to choose which set of features/drawbacks are most acceptable to you - without being 100% satisfied on everything.