I had same dilemma; to buy 2019 or wait for 2020 model.
Alloy Comp
By my opinion it is wiser to wait for 2020 model. You have to calculate the cost of 700wh battery into 2019 model, which is almost 25% of the Comp list price! So 2019 model should be discounted for more than 30% to have comparable specs with 700wh battery. Can you get such discount at the moment? I'm not sure.
Carbon Comp
There is only one 2020 carbon frame Levo left (beside ridiculously expensive S-works), the Expert version. Comp Carbon is presumably out for 2020 and the 2020 Expert has estimated price of 8299€ and just marginally better specs than 2019 Comp Carbon (beside battery and fork).
2019 Comp carbon with at least 15% discount + additional 700wh is very interesting alternative, almost 1300€ cheaper than 2020 Expert list price. So by my opinion, discounted 2019 Comp Carbon + 700wh is better buy than 2020 Expert and there is still some money left for your favorite fork.
I wanted carbon instead of alloy frame, so I choose 2019 Comp Carbon + 700Wh + Fox36 factory for better price than 2020 Expert. The fact I can ride it today is additional bonus!
BTW is anybody interested in never used FOX 34 Rhythm E-bike, GRIP damper, 29" Boost™, 150mm fork?