Modern Rolex's crystals are flat, but it doesn't mean they are better or worse, or cheaper. In most cases they are made of synthetic sapphire which is very hard to scratch.
Omega makes some of the best double domed sapphire crystals for some of the vintage inspired models, they almost have the distorted look of plexiglass, but it is sapphire.
I also like this effect in my 111. The anti reflecting coating helps for clarity.




Enjoy your watch!
René