the se535 is very mid forward, and it doesnt come anywhere near the W4r's instrument separation. also the se535 dont have a wide soundstage. its not um3x small but its not w4r wide either, kinda in the mid.
i found the w4r to be very fast, and have good attack and decay, but that really depends on the aspect of decay, as far as bass decay, or vocal decay. now i will say this, i dont use any dap or any music player straight up...so my perception needs to be taken into account the usages of algorhythm solos,ibasso db 2 dacs and ibasso pb2 and RSA SR-71B Amp... so amp and dac are going to play a role on fastness and attack and decay..... just something to take into consideration