yes softbox improves lighting, reflection & color.
but I must say that the tcw file does not have any lights switched on.
the lights you see are the standard light set that tc places for you when you draft ,quality or advanced render without using luminances
These are turned off, otherwise it makes this image too bright.
as a trial try the following:-
if you go to OPTIONS-RENDER SCENE LUMINANCE and set to NONE ,then re-render in quality, you will see a darkened image
I presume that this is lit only by the environment.
then go to VIEW- LIGHTS- RESTORE DEFAULTS(TOP ROW FAR RIGHT BUTTON) , re-render as above, a much more vivid ,almost sharper image appears.
it appears to me that a mix of softbox made enviroments & some lights can give a sharper image.
Hope this helps John.