Eryck K.
Yelp
I don't think there is a better on-mountain dining option in Zermatt. But that doesn't mean five stars by default: the food is good, but not consistently five-star good. Also, if you want to eat here, DEFINITELY make a reservation.
Okay, to start with the high points: First and foremost, the Bloody Mary tomato soup is among the five greatest things I've ever eaten. Seriously. And I'm not normally the biggest fan of tomato soup. It's incredible, and that was BEFORE they came by and asked if they should add vodka to it (FYI, don't say "no" to that question, here or ever). Also notable was the service: not incredibly fast (though I'm from NYC, so ALL service feels slow to me outside The City), but extremely warm and friendly. Big plus to the experience.
After the already-discussed soup, we had the veal, which was excellent, and the perch, which was good (but not excellent). A brownie-and-blackberry-mulled-wine-ice-cream dessert special was similarly good, but the brownie in particular was nothing to write home about (and let's be honest, you're in Zermatt, so you probably ARE writing postcards home).
Overall, very good experience. Strongly recommend, and definitely worth the price. But not a steal (except that soup; oh God, that soup...).
Finally, a warning that as of right now, Yelp has the location wrong for Chez Vrony. It is NOT in town; you have to take the "6" run from Sunnegga to Findeln to reach it.