this is the 16F cabin
http://www.travelsworlds.com/wp-cont...s-ydk5rhsb.jpg
this is more or less the 26F version
http://boardingarea.wpengine.netdna-...ints-blog1.jpg
clearly a big difference in the experience. If you are confirmed in F, you should be able to switch to a 16F variant as long as there is availability in the cabin, per the new SDC rules.
as for service, it would be the same, the transcon special - antipasto meal, a choice of three entrees, and gelato and/or cheese plate. the entrees are usually a beef or pork thing, pasta, or chicken/salmon option. Last time I had a cedar plan salmon. Tasty and very appropriate for the route
You would also get the BE headsets and westin blankets + amenity kits - but a lot less space to enjoy them if you end up in a 26-er.
I doubt there will be an equipment swap unless your flight is later in the year... seems like the 26F birds are flying consiwtently coast to coast...