to me, he has the best voice in ze:a. though they give kevin & dongjun the most parts. kevin does have a good voice, no doubt. but i feel like hyungshik has his unique color to his voice. his voice is deep but he can hit high notes so beautifully. he really needs to be on Immortal Song so he can show off this beautiful voice of his.
in general, i wish hyungshik, siwan, kwanghee, junyoung and minwoo would get more parts. they basically give half of the song to kevin & dongjun which i find unfair. ):