Nothing special doing at TXL for any Elites that I noticed (I am CO Plat). However, at TXL I was given extremely courteous and careful consideration in changing seats on the Cityhopper but I don;t know whether this was due to status, a C class ticket or maybe just that there are nice people at that desk.
The best seats on the Cityhopper are the bulkheads because there is a lot of room to stretch out, but no seats that I have ever been in on the Fokkers are really terrible.