Considering Deep Down is almost certainly multi-plat and wasn't running on PS4 hardware, Microsoft could easily show DD 'running' on Xbox3. They won't of course, but there's no reason to think DD on X3 would be
appreciably worse, visually speaking, (
rumoured specs not withstanding).
Almost certainly. Considering the visual differences possible based on design choice, environmental demands, game style, etc, (see KZ:SF's open world vs Deep Down's enclosed spaces for example), it's a brave soul who would try to equitably compare such wildly different games across two platforms. Plenty of brave souls around here though.
Which is why their first-parties have to step up and make the system they designed themselves
sing.