'35 , SportaPro and PortaPro use the very same drivers , share quite the very same sound ( apart from mmetric positioning over the ears ..) ; they share an easy-on-ear sonic signature : air , nicely warm bass , little dose of impact - and groove .
The
Sporta-Pro are the most easy to carry on , very un-noticeable for my head and ears comfort-wise also because I like to wear them on jogging , and they give me the best air feeling while sound's on too. They're foldable .
The
Ksc-35 are Sport-Pro on clip , nothing more nothing less , they can be better or worse then 35' depending only on your comfort point and use , the sound is very similar to Sporta-Pro , maybe a millimeter less airy ; they can be clampy (or not, depending on own ears shape and skin sensibility) with the clip ; they are not clampy on my ears ; they weigh on ears where Sporta-Pro weigh or press (very lightly) on head .
The
Porta-Pro are the more bulky , more weight , not foldable , same sound , so no brain for me their behind both Sporta-Pro and '35.
The
Ksc-75 are not same tier as '35
( sorry for '75 fan club ) less musical , less bass , less groove , more grainy highs , more bulky , and toy-look too.
I find the 35 and Sporta-Pro the more versatile , being lightweight and useful in different situations , and fun sound , "the" head-fi introductory portable headphone
everyone should own, and a steal for their price .