The soundstage and level of detail will improve if you increase the brightness slightly because you will hear the reverb better and most of so perceived "details" are in treble anyway. That doesn't mean this level of treble was in the original recording though. Increased mid-upper bass will make it sound fuller and richer (for example hd800 + any tube amp), increased compression or worse channel separation will make it punchier. There is nothing bad about this coloration, but it's not transparent. It could have been added at the recording stage. The main point that's being dicussed here is whether Delta-Sigma modulation based DACs are inferior or not. I think I propose a very reasonable thing to do — throw a high-end S-D modulation based analog-digital-analog conversion (precisely volume matched) in your favorite signal chain and see if it changes the sound (ABX, double blinded, being honest with yourself, whatever). If S-D cripples the sound it should obviously result in some kind of audible difference. If it's transparent there will be no difference and you will still hear the coloration you like.