In terms of detail they should be the same, multibit DACs dont highlight details like S-D ones do. But up/oversampling if done well, improves transparency, because prevents the HF noise to contaminate the audio bandwith. Speed, cant say for sure, probably it is slightly improved, maybe not.
I didnt notice a difference in soundstage, while for instance I do when a converted uses additional DACs, i.e. metrum octave to hex, or audio-gd dac19 to ref7.