i have played PD (my lil bro has it) and i dont think it looks better. you can tell they are using more effects (lighing, particles, etc.) but i dont think it looks better. the screen was always sluggish and very blurry. i have played it with the ram pack and i really didnt see much difference. like i said for me the game looked so bad it was hard to play, i thought that they tried to throw too many effects at once that it did nothing more then clutter the screen with blurry lighting/lens flairs/textures. basically to me it looked like they had to comprimise the quality of the effects they used just to fit them into the consoles ability.
again, i thought the game had great potential but was held back by the N64's technical draw-backs. i have all the faith in RARE as i think they pushed the N64 better then even nintendo did and im looking forward to how well PDZ turns out.