Sun (not "SUN") innovated a lot more than you give them credit for. Sometimes it wasn't about inventing something, but knowing when to ride with a good idea. Sun was a proponent of open systems when that was hardly the popular trend in computing. Sun invented the first practical network file system and remote procedure call mechanism. Sun was a champion of UNIX, and one could make a strong case that Linux would not even be a blip on the graph if it wasn't for that. Sun took the idea of RISC computing and rode it to the top. Sun championed distributing computing back when their competitors couldn't even figure out what "The Network is the Computer" meant.
They also innovated in areas you're probably totally unaware of. Remember Token Ring? Didn't think so. IBM was pushing their own funky network topology; Sun countered with the work that took the Ethernet standard from 10 megabits to 100 megabits to a gigabit.
Sun also had victories against the likes of SGI with true innovation: their GX card blew the lid off of low end graphics and started pushing SGI more into the niche market. (The GX card team went off to start a company you may have heard of called NVIDIA).
You can dismiss Java if you want, but it changed the industry.
Seymour Cray, AFAIK, never had one second of interrelationship with SGI. He was long gone before SGI bought and pretty much killed Cray -- firesale-ing Cray BSD to Sun in the process, spawning Sun's most successful midrange product line ever. So who did the most justice to Cray's legacy?
There's more -- the industrial design of the SPARCstation 1 and the associated SBus standard was groundbreaking as well. And, although late to the open source game, they moved very quickly to become one of its most active participants: OpenOffice, Solaris, Java, Glassfish, Grid Engine, MySQL...
SGI did some very nice things in graphics, and a few fillips in high-end performance, but their mark on the industry is nothing like Sun's.
If you don't think SGI, and HP, and IBM, weren't at the same time trying to kill Sun, every minute of the day, you truly have no idea what the industry is about.