Upgrade from i5-4570

Solution
Depends on the use and need. For gaming? No real improvement will be seen. They are both tier one CPUs for gaming.
But if you have a system that is capable of OC'ing, you might gain some more performance from the i7.
You can see some improvement in some games by upgrading to the i7. Also, can you overclock the i7-3770K? What motherboard do you have?

You should probably list all your system specs and state the main purpose of you system and what games you intend to play if any.

*Probably better to save your money for a real upgrade; new CPU/Mobo/RAM.
 
No. The cost of the upgrade doesn't justify the performance boost unless you get that i7 for cheeeeeeeap. I've got a 4590 and I've been looking into the upgrade. It is still quite expensive for what you are getting. You are looking at a 10% performance increase at stock speeds. It isn't worth it. You are better off saving your money and getting something more modern with more cores like the i5 8400.