Codeigniter compared to Zend Framework 2

[eluser]php_princess[/eluser]
Hi there. I'd like to hear what the CI community thinks of ZF2.

All I've ever used is CodeIgniter and while I love how simple it is to use, I wonder if another framework might be better suited to my needs. I've thought about trying ZF2, but I'd like to look before I leap. What do you guys feel are ZF2's pros and cons, in comparison to the pros and cons of CI?

Thanks in advance! (And yes I Googled this. I didn't find much. I'd like more opinions.)