I managed to try the Shure SRH840 today. Its was very brief testing as the people with me did not like waiting for me. Managed to try the Akg K601 also, but that's another story completely.
Back to the Shure SRH840 immediately when i put them on i noticed the sound was very good, slightly more bass compared to the Akg K240 but nice controlled bass. It was noisy in the shop where i tried them but the SRH840 managed to block majority of the sound. The sound, sound over all was nearly perfect.
But the comfort is another story. Pads were soft but in my opinion a bit too shallow, that and the strong clamping force they had made me cringe.
The pair was a demo pair so the clamp should have reduced quite a lot. But still it was too much. It started to hurt in only 10min.
Was also surprised how bulky they are. I noticed they do weight quite a lot, but that was less of an issue compared to the clamp.
So i think Shure SRH840 are not an option for me.
I seriously need options, im even starting to consider On-Ear models.