No, iOS7 killed the iPhone 4. I have one here.
I gave it to my father when I got the iPhone 5 and when I gave him my i5 he returned the i4. It's my only spare phone and it was once my favourite. Even my father hated iOS7 for killing 'his' iPhone 4. It slowed the thing down incredibly. Lag whilst typing, horrendous web browsing lag and the only thing it remained ok for was phonecalls/texts & apps. Some will disagree but I think iOS7 killed the iPhone 4. Few wouldn't have wanted to upgrade their phone the moment they installed it.