Yes,Being a planar magnetics, I really loved the soundstage and clarity of sound of he400 and that is the reason they are with me since so long. It would be a big leap for me to go to an ANC headphone, since they use EQ to modify the sound for your taste(this is my perception, no offence to anyone). I haven't took a demo of wh1000xm3, but online reviews are all good, nobody mentioned any major drawbacks, but surely visit a sony showroom for a demo, before buying.
I bought them for around 32k and added velour pad, shorter lighter cable for around 4k. I will be happy if they can fetch me 13-14k now. I have kept them neat and clean, clean the pads and metal after a couple of months.
When i purchased he400 i was in college and all listening was limited to a room, but right now, with my job, I have to spend 10 15 hours every week in metro and my soundmagic pl11 are not able to isolate whole noise from surroundings, that is one of the reason I was looking forward to a ANC headphone. I thought of buying LCDs, but new one are completely out of my [30-35k] budget. So,what ever little research I have done in past one month, wh1000xm3 seems to be best. I am open for suggestions if anyone have which fits my scenario.
PS: sorry for a delay in reply.