Here is the space comparison between the update before and after:
|Command: df -lak||Used(Kilobytes in 1024-blocks)|
By the way, iMac 24 has 500GB space, and the capacity is 41%. Now the new iMac 27 has 1TB space and the capacity is 21%. That's a huge increase in HD. I am very happy about this hardware change.
This upgrades contain several items. Here are snap-shots of them: