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Seagull Joe
Ike is tied for 9th fastest air speed, and has the same run speed as Kirby. The fact you think Ike is slow in the air suggests that this is one MU that does not fall in your range of "I've played 80% of this MUs".
Ike vs Sonic is the MU in SSB4 I have the most off line experience in. By a fair margin. As in I have a 100% win record against Sonics with my Ike in tournament.
Its was a 50-50 MU before customs and before the most recent patch. Ike has very little problems dealing with Spin Dash and all of its mix ups in general. Ike can also play fast enough with his auto-canceling aerials and Jab/Dtilt/Grab game to not leave Sonic with much (or anything) to punish much like how Sonic is fast enough to leave Ike with minimal chances to land a hit. Both can wrack up damage on the other quickly if they DO get in and land a solid hit finally. Their tools worked in a way that the winner was strictly whoever could get inside the other person's head better.
With the patch however, Sonic is not going to have an easy time killing at all. Half of the time I died it was to Bthrow. That is no longer the case. I firmly believe that its now probably 55-45 Ike's favour. Customs gets interesting in terms of Sonic's Side B customs vs Ike's CQC and I haven't gotten to play that one out. Given how Ike's CQC works however it most likely clanks or beats Sonic's Side B whenever he doesn't have invincibility/intangibility/whatever is going on with his customs.