There are a number of different things going on in these photos, which may make your question a wee bit too broad for this format, but...
The first thing is that these are VERY well taken photographs that have been expertly lit and taken with just the right exposure and aperture to capture tons of detail. In addition to that, there is clearly an amount of compositing in some of them. This might be just different exposures for foreground / subject / background or it may well be the addition of elements that weren't present in the original shot. Then there is the colour treatment. It would appear to me that various areas have been isolated and over / under saturated to achieve the desired artistic effect.
All of these things are very subjective and specific to the image in question, so there is no easy fix or one-stop-shop to duplicate the effect.
That said, I suspect that the one overriding feature of this style is the exaggerated, somewhat super-realistic sharpness of the images. This can be achieved in Photoshop using Unsharp Mask (
Filter > Sharpen > Unsharp Mask) so I would suggest that you search for tutorials on how to best use that filter.
It may require multiple applications of Unsharp Mask to replicate this kind of effect. Probably one wide, subtle pass and one that is narrower and stronger.