Mid-flight meal service is sadly "at the discretion of the SFS" whether it is actually served to passengers in Biz class or not. It is catered but the crew are not supposed to go into the aisles to serve it if doing so would disturb sleeping passengers. Some lazy crews see this as an excuse to simply skip the service. It's the same with breakfast service on some overnight flights. Again, biz class gets the short end of the stick. First is dine-on-demand and Economy is formulaic, but Biz winds up being squeezed.