Note that the M50's are a year old, and the Pro700MK2 are 2 days old. The M50 will always be pictured on the left, and the Pro700MK2 on the right. I didn't have my camera, so these are taken with an iPhone 4g. I'll write a comparison review in a few months.
The pro700mk2 is pictured on both sides in the picture below. M50 pad on the left, 700mk2 on the right.
Pro700MK2 with all accessories. I don't have one for the M50 unfortunately, but there are plenty available on the net.