Sorry man, but I believe there have been some objective comparisons which search will surely unveil. Sometimes they might get a little "bashy" but the consensus is that the e70 is heavier, more refined feeling, bigger, and until the 50i came out not as quick as the iS. Not sure if you put this in the e70 forum, but might get more bites there as that's where people who have made the switch will more likely hang out. I have only driven the 30i as a loaner and it felt really slow and bulky.

Scott