Kai's right about the secret stuff. Rarely get anything out of a brewery other than numbers like, OG, BU and ABV. I've been to nearly every major German brewery and can't think of one that really gave me any sort of usable info. The majority of the big guys have their malt specially made for them. Its not undermodified in the least. A few big breweries still do decoction. If you want to see what some smaller breweries are doing go on a tour of Franconia and Bamburg. Tons of small guys making an awful lot of great beer. Kai is right in that I've also never seen a German brewery that does a single infusion. I'm sure there may be one out there, probably an alt or something.
As for the Zoigl, it depends where you are how good it is. I've had some great ones and some terrible ones. I've also been to Zoigl 'breweries' that were out of beer.
Most of them have been pale, 5% abv beers with a lager ferment 6C or so and then a short lager. Some have been hazy, some quite bright. All different.