I have not really noticed any difference apart from the new security patch. I am with Vodafone and it seems that some updates come through really quickly, but had to wait quite a while for the larger June one. From what I have understood updates should come from Samsung in batches by serial number etc. But as said there are massive differences when updates come through.
I believe, according to the firmware checker on Sammobile.com that EE versions still use a slightly different software to sim free versions which is why you and I haven't started to see the updates yet. Having said that, I got the July update on 4th July so hopefully we don't have long to wait.