Not a significant change.
1. From a C8 you need to step up to a C11 or a 12" of some sort to see a significant benefit. The downside is a huge increase in size & weight.
2. With Celestron/Meade SCT's what you get in the way of optical quality is basically a matter of pure chance - a small few are very good, most are rather ordinary, and there are some real shockers - some C8's cannot resolve Cassini's division on Saturn, for example.
if you are going to splash the cash I'd suggest you consider alternatives, and these depend on what you want to use the scope for.
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