Not at all. It opens email instantly unlike my 4S. Everything is faster on my Nexus 4. Ever own one?
I'm with you on this. I have a plethora of phones and use the Nexus 4 and iPhone 5 as my primary phones. My every day phone is the iPhone 5 since T-Mobile just got it and I've worked there for quiet some time now. I had the Nexus 4 up until then and just received the Galaxy S4 (haven't used it yet).
The Nexus definitely is one of the fastest phones I've used. My iPhone syncs up so much better with all of my Apple products though and I don't think I could give up those features.
Most of the mid-grade Android phones are laggy because of the bloatware and in my personal opinion objective c > java.
Android is java and iPhone is objective c.
In the end, I have no complaints with either of my phones but the iPhone saves me a lot of time with memos, reminders, iTunes, remote app and iCloud.