I don't have S5 yet, but as potential buyer i have 2 questions for those who flashed custom recovery or kernel and rooted their S5:
1) Does fingerprint scanner function work with custom status and knox warranty void=0x1?
2) Do you see red message on top left corner of initial boot screen (something like KERNEL/RECOVERY SECURITY CHECK FAIL) if you flash custom kernel or recovery?
(With custom recovery you may see this message only when you boot into recovery).
Samsung Galaxy S4 SHV-E330S: Optimus ROM (TW 4.4.2) & Kernel. CPU OC 2.7GHz, GPU OC 645MHz, non-KNOX bootloader, UHD/SM/360 Camera.
Samsung Galaxy S4 GT-I9500: Optimus ROM (TW 4.3), Perseus Kernel. CPU No-OC, GPU OC 700MHz, non-KNOX bootloader.
Past models: Samsung Galaxy SIII SHV-E210K & GT-I9300, Samsung Galaxy SII GT-I9100.