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I can't speak to astrophotography but I've compared visually my C5 to my SV503 102ED on the same night.
For the C5, I used a 9mm Nagler Type 6 for 139x whereas for the SV503, I used the SvBony sv215 zoom at 5mm for 143x.
I found that I marginally preferred my freshly collimated C5 on the moon, Saturn (it was the only planet at the time) and 47 Tuc. Whereas the SV503 felt slightly better for M7 and splitting Alpha Centauri.
So I would imagine the C8 would provide much better light grasp for galaxies and resolution for planets.
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