Why is the new Nexus 7 being compared to the 8 month old iPad mini?

I'm seeing a lot of reviews compare the new Nexus 7 to the iPad mini. I don't get why people are comparing a brand new device to one that is 8 months old. Samsung released new Galaxy Tabs, there are new Windows 8 tablets out there. Why not compare to those. Especially why not compare to other Android tablets. Seems like that would be a more useful comparison.