Although I've just gotten here, I'll have to go out on a limb on this one. I have tried many waxes and synthetics. Despite Zymol's cost, all things being equal, IMO it will be very difficult to surpass the live in-person results that a Zymol is capable of producing.
I am an avid user of Concours and now Vintage, and in addition I also use P21s on my daily driver. I admire different lsp's for their abilities and types of use. For everyday durability while maintaining the high finish results that carnaubas are known for, P21s is an excellent product that produces a lasting result.
However, if price is not an object, and if you demand show-stopping results (with the right preparation), then IMO I have yet to see a wax that could out render a Zymol Estate Wax. Zymol's talents do not necessarily lie in its shine power. Zymol's most distinguishing aspects are its ability to render paint color, and its ultra sharp paint depth, clarity and reflective abilities (aspects that are not readily seen in lsps). You can sometimes tell with good digital pics (but not pictures alone...must be paired with live sampling against other lsps) how far away objects get reproduced clearly in a zymol estate's finish vs. some other lsps. The ultimate test, however, must come from an individual's unbiased test. Don't necessarily rely on heresay because test conditions, paint, and individual judgment sometimes will cloud an objective comparison.
The prices that Zymol asks for, however, are insane. It is ridiculous to try to justify the price to most users. But if you are just judging by ability alone, and given all prep and conditions are equal, then Zymol is IMO among the best waxes available.