The finish is clear acrylic lacquer on all the 452s . It is very hard and durable, and will rub out to a high gloss finish. It should be sanded with something like 2000 grit wet or dry to level it, and then polished with a fine polishing compound to get that finish your after. I used McGuires cleaner wax to polish mine and it looks like a Browning now. The stocks that are made of beech wood don't need to have the grain filled and generally have enough finish. The finish on some of the Standard or Training models is darn thin and could stand some additional coats.
Some of the Americans don't have the walnut grain filled very well, so nothing short of some additional coats of something like Tru-oil will do the job. I have not seen a Lux, as yet, so I can't say how well they are finished. You don't need to take off the finish, but you should sand it lightly, and wipe it down with mineral spirits to clean off any wax or oil. When the grain is filled and the finish has cured a few days, you can do the 2000 grit wet sanding to remove any flaws. Be very careful not to overdo the sanding on the edges and corners. The final polish is done with the McGuire's cleaner wax to a hand rubbed lustre. It usually takes a couple of applications to bring up the shine. Polish small areas at a time, and take your time.
No reason these CZs can't look as good as they shoot.
Good Luck
Jim W.