HD 599

I don't know about the blackshark but I can tell you my experience switching from cloud alpha to 560s. At first the 560s seem to have a lot less bass because of the neutral tuning and open instead of closed back build. The bass punchiness is missing. The sound profile is bright, similar to cloud alpha so I enjoyed the sound from the beginning. It was just perfect, no eq needed  The detail retrieval of the 560s, imaging and soundstage were much better. After using them for about 2 weeks they seem to have more bass. The brain tunes in to the new sound. But I still loved the alphas so after a year of 560s I bought a new pair of alphas (I gave the old one away). But... they did not sound as I remembered :)) Bass was muddy, details were missing, treble was further away. You don't notice so much the upgrade as you notice the downgrade after using the 560s for a while. The 560s are excellent headphones. They have superior soundstage, great detail, great imaging, you hear everything from footsteps to whispers. They are audiophile headphones. People refer to them as mid range probably because they have mid range build quality. But for sound I think they can be considered high end. They can trade blows with the hd600 which are high end. 560s has a wider soundstage and an extended bass response.  Music sounds very good. Voices like Enya, or ballades from Roxette sound divine. I really tried to find a difference between 560s and 600 but apart from soundstage they sounded identically. Same voice, same tonality, same dynamics etc. The velour earpads and open back don't cause much heating. The earpads are bigger than usual, they are lighter than most headphones and are really comfortable. They run just fine on a good motherboard audio or a good usb dongle. No separate dac/amp needed. Beside them getting louder you won't notice a quality or sound difference. I also tested hd599, hd600, meze 99, meze 105aer, beyerdynamics dt770, ananda nano and some I can't remember. In the end the 560s for me is the best pair. With a little bit of desire to also get the 105aer. The reason I gave up my alphas was that the earpad's fake leather broke down and I could not find original replacements. Any other earpad alters the sound dramatically because of different sizes. But the 560s share the same earpad with many other sennheiser models so replacements should be easier to find. Also velour should be more durable than pleather. So yes, at 120 eur they are a best buy. I don't think you could get anything better.