They’re not that hi-res, It’s merely an illusion created by the hi-res materials and extensive model and material work to see what looks best on the source engine. And even their materials are not that high-res really.
Good example is this model
pay attention to the hair, You don’t see this much on the fakefactory’s models because they do more work on making multiple layers for the hair.
The “realityness” of models in source engine is mainly based on the amount of big details on one object and the physics(YAY! look the combine got shot!) The realityness in the new rendering engines are based on natural details(zits, scars, etc), symmetry of the whole model and the lightning effects(this means they’re rather round than blocky, and the skin has a bigger color map ranging from dark to absolutely white. Thanks to the lightning)
You need to consider if this is worth of it. The models will not look the same when used in source engine. They barely even look the same considering all the model and material quality changes. and of course minus the fancy lightning effects.
Good example of this is the MW2 ported models, But even they do not show how much models like this will change when ported to source engine.
[editline]1st January 2011[/editline]
Overall you should note that these models are not meant to be used in such an engine, They’re rendering models used to produce mainly somewhat good looking images.