HTC Sensation ----> Nexus 4 ...What to expect?

So I've been using an HTC Sensation for the past couple years, Its currently running CM 10.1 at 1.7ghz. There is little lag and most apps run just fine, despite this lack of problems, I am ordering a nexus 4 now that it is back in stock. What should I expect in terms of differences seeing as my current phone is running the same OS?