I think it's an apt comparison as much as any comparison between the Tesla and another car. At least they're both approximately close in price. It wouldn't be very fun if we could only compare the P85D to other electric vehicles with 4 doors.
I was looking at the i8 because that fit what I wanted way more than the P85D. If I had a chance to test drive one, and actually get one then I might have. I didn't get a chance, and the sales tax exemption for electric vehicles was expiring so I got a 70D instead.
I think a lot of people underestimate how many people got a Tesla MS despite the fact that the Tesla MS didn't really fit the type of car they wanted or that they normally drive. Especially when it comes to how big it really is.
The i8 is interesting because it's the first performance orientated hybrid solution that while ridiculously expensive isn't ludicrously expensive like the Porsche, or the Ferrari. The new way to build a performance orientated car is to use electric power for instant torque and then gas power for range. My round trip commute is less than 20 miles so I would have been using electric power for most of my driving needs during the week with an i8.
For me personally I like hybrid solutions. Anyway I look it I'm going to have a hybrid solution. I have a hybrid solution right now because I have the Tesla and I have a Jeep wrangler unlimited. I think it's a good combination of different types of cars, but I wouldn't have the Tesla without ICE backup due to infrastructure limitations. Like I took the Jeep out to Mount Rainer because there wasn't much in terms of charging solutions near Mount Rainer.
Sure I know they're not as PURE as 100% electric, but they get the job done. I would have looked into a Volt had it been more performance orientated.