Well, I thought Microsoft was actually a Sony-Heavy. Harddrive, bigger system, most power. But I do agree they seemed to be going down the same path overall.
This generation I think Microsoft has already found the thing that makes it stand out: online. If Microsoft was really shadowing Sony, they would have announced HD DVD support and delayed the system forever and priced it way too high. In fact if anything, Sony is copying Microsoft by including a harddrive with every system...something that Microsoft discovered might have been an iffy decision for the original Xbox.
Edit: Though let's face it: at the end of the day, their strategies are the same because neither company is putting any imagination into it. What Microsoft and Sony are doing is basically the same strategy any 14-year-old fanboy could have come up with: HD support and better online topped off with the usual graphical improvements.