By class I mean what competes with the Mustang on the sales floor.
I was always into Fords and BMWs. I have had various Mustangs and BMWs.
I can say without a doubt - BMW is in trouble with this new Mustang. I test drove a GT today and was blown away. Who in their right mind would buy an M3/M4 for $60-$75k, when you can get as nice of an interior (with premium trim), and an amazing exterior 2015 stang for less than $40k?
Ford has really upped the quality on these new Mustangs. I would say very close to BMW feel.
As you can see from the comments on this board, the "sales competition class" is a really big class. Some people are shopping "BMW Vs. Mustang" and care a lot about the quality of the interior. Others are shopping performance - and only care about "fastest on the hill." Others are shopping price/looks and their shopping list includes a wide list of other cars - including the Genisis Coupe (Which weighs less). It is probably only the "performance buyers" that care about the weight - and they are less focused on cost.
2013 Mustang GT Premium Convertible
Candy Apple Red, Auto, FRPP Tune, GT500 Axlebacks, KONI Yellow Sport (adjustable dampers), FRPP Front and Rear swaybars, Custom Removable 4 Point Roll-Bar, BOSS 302 Low Expansion Brake Lines, Roush side splitters, GT500 spoiler, Redline Tuning hood struts,18" Ford Chromed Aluminum Wheels (9R3Z-1K007-A), Michelin Pilot Super Sports - 235X50X18
2011 Mustang V6 Premium Convertible - Gone