D5s start under 80k, serious 4wdrs would want base model.
Infact middle of the range atm for 78.8k, insane value
Discovery Offer
79 gxl dual cabs utes range from 70-100k dont they, then people spend 25-50k on canopys, fixes and mods.
Pretty much in same ballpark
One is a do anything 4x4 the other is designed to go from worksite to worksite.
Too very different 4x4s, both good in there own way.
Imo the defender wont be targeted at 79s directly, it will be targeted at people that want a durable and capable do anything vehicle, if they release a ute version which is rumoured maybe that will be work suitable and they will Target that market as well. 
We have been through all this before on the won't be retro thread