Most likely because Source Filmmaker uses resources from the game, and the current model is more detailed than the one they used a few years ago.
That looks the same, the second one just has color correction.
http://www.youtube.com/watch?v=RHeipUKdRWEThis guy's Meet the Heavy edit is just silly, there should be a blog post of the best Meet the Heavy edits one day
There's a slideshow on Valve's website that explains that it's actually the texturing. They used alot of new lighting textures and stuff. It's pretty cool.
Do you have a link? I can't find it, or have any idea what to search for.
I found a few slides, here's one:http://www.valvesoftware.com/publications/2007/NPAR07_IllustrativeRenderingInTeamFortress2_Slides.pdf
• Players must be able to quickly identify other players by team, class and selected weapon at a variety of distances and viewpoints
Well that's odd, most of the time I can't tell what team a Heavy is on, especially when he's on fire
