Those benchmarks are CPU based, and since the is a dual core (four threads) and the i7 is a quad core (eight threads) CPUs, the difference is correct.
Depending on your computational requirements (what you actually do with your computer), you might see a difference in daily computing.
Browsing the web, playing a game now and then, writing essays, editing a video every now and then, listening to music and so on can easily be handled with a dual core i5. Anything more CPU demanding on a regular basis (editing video weekly or more often, playing games often, converting compressed files, calculating pictures en masse or any other data en masse) is better handled with an i7.
I have gone from a mobile Core 2 Duo dual core (two threads) CPU to a desktop quad core (eight threads) CPU just a week or two ago and the difference is astonishing with CPU intensive tasks (even Flash is CPU intensive on a C2D Mac).
For example, as I haven't had a chance to fully exhaust the system with work stuff, I recently converted 20 or so ripped DVDs I had lying around for some time and always put off transcoding sing my C2D Macs, as one DVD would take 2 or so hours, in less than six hours. I had "problems" filling
HandBrake's queue as fast as it was (10 to 20 minutes per DVD (containing 90 to 130 minutes of video).
But on the other hand, the wonderful Compressor (app by Apple to transcode many videos to many formats) was only using half of the CPU and it still took quite some time to transcode a 13 minutes 1080p edit using an editing codec (not highly compressed and storing every farm) to several variants (1080p, 720p, 540p MP4 files and one DVD compliant file)m around two or three hours or so.
Anyway, a better/faster CPU might not be necessary for your if you barely stretch it.