well:
for the Jimi Hendrix vs Jimmy Page I call neutral as both are legends (perhaps Hendrix just infront)
however for Jimi Hendrix vs ACDC there is no question that Hendrix wins that..ACDC for me were (with Bon Scott) an ok Australian band (I lIve in Australia) but definently nothing special...Angus Young was definently a great performer/guitarist but ACDC as awhole a far to boring....ACDC without Bon Scott are pathetic and Hendrix easily wins it...
edit: oh yeah i forgot the second part:
Jimi Hendrix vs Bob Marley