Recently flew RT from Budapest to Madrid on a CSA (Czech Airlines) ticket. The return Madrid to Prague leg was with an Iberia flight with an OK code share.

I found it interesting that on the Prague to Madrid outbound (OK metal) there was a complimentary service (drinks and a sandwich) while the IB flight charged 2 euros even for water. Even the very short Prague to Budapest CSA flight had a complimentary beverage and snack. The difference between the two Madrid flight was palpable.

Not to mention the rude IBERIA GA in Madrid. This btw is typcially of Iberia in Spain, though in Boston and JFK I never had a complaint.