There's an interesting mix between the effective resolutions (maximum resolvable detail) on this 1024X1080 Hitachi plasma from movies, the 8300HD cable STB with NYC's TWC, and 1080 DVDs.
If movie 1080/24p master tapes are still limited to ~800--1100 lines of horizontal resolution (motion video equivalents) as outlined
here earlier, then the plasma seems to cover this range. Resolution numbers aren't abrupt, of course, but gradually fall off, so suspect a higher-resolution display (1366 or 1920 horizontally) might show 'crisper' images--akin to viewing or capturing crisp images through precision high-MTF (modulation transfer function) lenses versus less-crisp images from just-adequate glass or plastic.
NYC's TWC 8300HDs cable converters appear to deliver ~1300 lines, as I'm still
measuring with my CRT RPTV; a local 1080p FP owner recently measured
1335 lines . So, unless new measurements show movie master recordings used for both cable and 1080 DVDs are better, cable STBs shouldn't be blocking movie PQ. Since 1080 DVDs, using higher bit rates or more efficient codecs, needn't compress HD video as much, tossing out higher frequencies/resolutions, they should deliver greater PQ than movies via cable where signals may be rate shaped with requantization and decoded/reencoded for statistical multiplexing, then delivered at