You think that because most people use canned keyshot shaders and settings which inevitably leads to the typical keyshot look. If you would set up your shaders and your lighting from scratch and with knowledge about rendering like you have to do it in Vray you would probably get very similar results to Vray. That pros use Vray is usually not because keyshot is lacking rendering capabilities, is is mostly due to other reasons (workflow, features, etc.).
It is like saying KIA engineers are not as talented and hard working as Porsche engineers because their cars don’t drive as fast.
Besides, what sets an okay render apart from a really great render is usually not a rendering software but good old Photoshop 