1080p mkv Files: Dedicated Media Players(Dune, Popcorn etc.) vs TV's Built-In Player

Will there be a noticeable or appreciable difference in video quality between a dedicated media player from the likes of Dune, Popcorn Hour etc. and the built-in media player of the TV?

I'm currently running a HDD directly into the USB port of a Samsung D550 plasma TV(the built-in media player is great, can play most formats with ease and picture quality is excellent). Will there be an appreciable if not significant difference if a media player with Sigma or Realtek chips is used? I'm looking to try a Himedia HD600B player which comes with a Realtek 1185 chip.

Does anybody know what video chip is inside the Samsung built-in media player?

Any advice appreciated.

Thanks for the thoughts. Much appreciated.

I too thought that the difference would be minimal at best. However, one main advantage of the media player (in my case) is it will enable CinemaSmooth, a feature of the TV that will enable an even 4:4 pulldown cadence with 24p sources. Without CinemaSmooth, the TV will be running a 3:2 pulldown.

Mixed reception on the benefits of CinemaSmooth so far although those who thought it brought a significant difference overwhelm those who felt otherwise.

Perhaps I should get a standalone media player(looking at the Himedia 600B) to run 4:4 cadence.

Any thoughts whether the improvements(reduction of motion judder with the elimination of 3:2 pulldown, if not improved color accuracy or video quality with superior Sigma/Realtek chipsets) would be noticeable if not significant?