The wakes are very similar. I was always impressed when I put it at 30mph and the wake would be very small and crisp with the trim tab UP versus down or mid-level for a skiier. When I put it mid-level, and got up to 35mph, the wake was barely there. Great boat for skiing behind.
There will be a bit more room, but not as much as you think. A lot of the length comes in at the bow and width. Plus the seats on my Mariah are the split-V seats that can really only hold two people comfortably. Versus the comp with the rear bench. One of the reasons I like the Sunsports so much vs. the Saltares. Sunsports have the rear bench. Saltares have the V-split seats. The boat is wider than a Comp so it is bigger. The freeboard is not much more than an inch or two more than the Comp.
As for the bow space, yeah if you're not a big person you could lay in there, if it's completely empty. But your head would be sticking out the hatch area. I could lay down in my Mariah with my toes at the tip of the cushions in the bow, and my head was right there where the center walk through ended and the main floor started. But I wouldn't recommend it. It's more for storage.