"The GBA obviously matches the PSX in terms of sprites. Though we cannot judge animation."
Not true, PS1 could do sprites with a higher color palette. Now that I think about it though, PS1 didn't even really do sprites a whole lot except for backgrounds. Most on screen characters were "emulated" sprites using polygons to try and get around the RAM limitation. Alucard's shadows were actually done with gouraud shading.
"Even Castlevania DS looks like a first generation SNES"
Wow, you just said SoTN looked first gen SNES.... SoTN did run at 256 x 224 resolution, exactly the same as an SNES and only 32 pixels more vertically than the DS which isn't a whole lot of a difference at all. However, that doesn't mean jack as far as graphical capability, SoTN proved this. This new game could easily look better than the PS1 classic, not to mention the fact that it's already world's beyond the GBA CVs. AoS looked pretty good on the GBA, but you can't deny the fact that this one looks way more detailed. (for pete's sake, IMO... SOMA FINALLY LOOKS MAIN EVENT) Plus when you consider that this game won't be held back by the PS1's 2MB RAM, I'm positive that they'll be able to do more here than they ever could've done earlier.