I realized I have 3 Schiffer decks to compare, and they were all quite different! The Mary-El, Tarot D, and my newest Ring Cycle
First of all, the Ring Cycle cards are *definitely* not as shiny, thick, and chip-prone as the Mary-El. The Ring's cardstock is definitely thinner and more matte than Mary-El's, but not as completely matte (but still vibrant) and supple as the very delightful Tarot D cardstock.
If I were to compare the Ring cardstock to other big-name brands, I would say it is like a thicker Llewellyn. Downsides I see (just having it a short time) is that it seems like you might need to be careful of creasing. It is a hair long for me to riffle shuffle easily, but I can still manage (and I have long fingers) otherwise the cardstock itself doesn't seem to impede shuffling.
Overall a *huge* improvement over the older Schiffer cardstock. But I must say they should do more like how the Tarot D is - that cardstock seems uncreasable, unchippable, not too slippery, a pleasure to handle, and the images pop
Pics comparing the three:
First no flash, but each card placed in the same position on my table with the overhead light reflecting on the card. VERY reflective Mary-El (you can even see the reflection of my fingers in the bottom right), only a little with the Ring, and not at all with the Tarot D.
http://i.imgur.com/0XZ4QuE.jpg
Second all three together with flash, third showing edges (L to R: Tarot D, Mary-El, Ring)
http://i.imgur.com/rMFGk3L.jpg
http://i.imgur.com/yMW2ATo.jpg
Hope this helps!