Personally I thought that Honbo had one of the better fried chicken sandwiches in HK - until recently they seemed to have taken it from the menu. In absence of that, I think that Shake Shack's chicken shack is pretty awesome and a fair price to boot compared to Honbo and other friend chicken sandwiches.
I do have a profound affinity for a good fried chicken sandwich. I worked at Chik-Fil-A during one semester of high school and I haven't since experienced such a juicy, crunchy, flavourful product since then despite their homophobic political/religious attitude. We did a buttermilk brine + a pressure cook in 375F peanut oil for roughly 4 mins to achieve such a result.