street fighter 4 has awesome game play. though they haven't cleared up the most important canon item.
Who won the second world warrior tournament?
capcom claims that gouki (akuma in US) actually gate crashied the tournament and shun goku satsu'd Vega's (M.Bison in US) red suited ass. though they never told us who was fighting him in the end. canon guide pros say chunli or guile are the highest probability but i only really see gouki crashing in to save "his prey" ryu as vega is still a very very powerful fighter and may kill him before he taps into all his powers (gouki is a very very super hyper turbo max champion plus X powerful fighter).
the winners of the tournaments in other two numeric street fighters (excluding 4) have been mentioned.
street fighter 1: ryu beats sagat with a satsui no hadou shouryuuken that leaves saggy boy scarred
street fighter 3: gill lets alex win as gill believes alex is the chosen one.
other stuff
street figher ex is non canon.
street fighter alpha is a series of events between sf1 and sf2
street fighter 3 third strike is a series of events after sf3
street fighter 4 is a tournament set between sf2 and sf3
all "vs series" show off characterisations of capcom characters, thats all. ryu never met kyo, spiderman, jin
or ken the eagle in the sf canon universe.
final fight shares the same universe as street fighter.
my fingers are a bit tired.