There are some striking similarities between the Sony E primes (with the exception of the 16/2.8).
The three prime lenses from Sony, 24/1.8, 30/3.5 and the 50/1.8 are about the same size, physically.
All are IF (internal focus) construction with a large rear element.
None are affected much when Macro diopter lens such as the Canon 500D/250D or a Leitz Macrotar are added to the front (though infinity focus is lost).
All have decent resolving ability on a NEX-7.
I hope there will be more Sony E primes soon, hopefully with built in OSS like the 50/1.8.