anyway guys, this wifi issue on 8.0.2 is really on-off kind and pretty random. A very good scenario of testing it is through launching app store, under featured tab, select apple id at the bottom of the page, then view apple id. On wifi, it took 15-22 sec for the page to load, sometimes even longer. For 4G it took < 6 sec. Payment info took 8 sec on wifi, took 3 sec on 4G. I got stuck for more than 5 mins when processing postal code/telephone changes for US store account, on 4G it took < 10 sec.
I did the above test a few times at different timings and in all of them, 4G proved superior and the fault seems to lie in 8.0.2 wifi. I have no wifi issues on my laptop or other mobile devices, only on my 5S. Whats strange is that when i use the speedtest app on my 5S, there were no hiccups and i managed to clock consistent 80+mbps down/up with <10ms ping. Browsing with safari or using apps with network activity loader were slow and sometimes time out.