-1 SHR440, +1 ATH-AD700
Bought a pair of SHR440 2 years ago as my first "serious" headphones, loved it a lot but it's a pair of flawed headphones that leave you wanting more.
Got my AD700 for almost half a year now and I prefer it better than SHR440.
First off, SHR440 comfort is far from being good, the head band does not have enough padding and leave my head hurting for extensive use. The earcups are initially comfy but the leather wears off after 1 year or so of use. Some people may find the cups not thick enough thus having your ears push against the drivers. These problems are non-existent for AD700.
Sound-wise, I think SHR440 only advantage is it has better EQ than AD700 in a sense that it plays a lot more genres better than AD700 especially the ones' requiring more bass response. But in AD700 defense, the EQ is can easily be tweaked. Clarity wise, you'll find the AD700 easily beating the SHR440, especially in higher range. Consider the only advantage of a closed back design is the added bass response (and portability), the open back design of AD700 gives a more airy sound thus giving it a larger soundstage and more natural, clearer sound.
If portability is not a concern, I strongly recommend the AD700 over the SHR440 otherwise SHR440 should be a fine choice, just be prepared to pay for a new (and better) pair of ear pads down the road.