I've seen some review videos of 2019 ES and I have mixed feelings of what I've saw. The car doesn't look bad from outside. Unfortunately it is the only positive I can see as a GS300h owner.
There are some improvements in size of boot and rear leg room. For me this is not important, because 99% these parts of my car are empty. Taking look at instrument cluster, F-Sport looks almost the same like IS F-Sport or RC F-Sport - nice. Basic cluster partially LCD screen and partially analog is something that belongs into non premium class. I prefer nice analog cluster, but this one looks very cheap and inappropriate. Moving sight right I see big screen, glossy not shaded. Part below this looks like old RX - not very nice. Further below begins problematic part of interior. If You want to connect Smartphone to USB, You have to keep "ashtray" open. Next problem is where to put Smartphone. You will have to lead cable around gear lever to the box in middle console. It is only aesthetic problem, but one cup holder is behind the same tray and another one is open. Look at 5:39
I like in GS big box under armrest with USB ports and enough place to keep phone arranged on its place. Nice is there is wireless charger. but apparently smaller box.
Under the bonnet is new but for me as user almost the same non powerful rattling 4 cylinder engine in the same layout like ordinary cars like Skoda, VW, Mondeo etc... In my car this engine is sometimes smooth, but sometimes unacceptably loud and shaky, like it is going apart it is about 50:50. I wouldn't purchase it once again. I swithed from BMW 528i 4pot because it was too shaky, but after years this engine is even worst. Anytime i hit gas pedal i hear and feel rattling from center console, from dashboard, from passenger front seat, from left front door window molding... I will record it.
FWD vs RWD... My first snow experience with GS300h was great. FWD cars were stuck under the hill, but I was plowing snow uphills. I am unsure If this layout with heavy battery pack in rear will be at least the same good on snow.
I can also compare costs almost equally equipped GS300h and new ES300h:
My 2016 specs for 51800€ is almost identical to 2019 ES300h Prestige 55900€+ Metallic paint 1200€+ Premium Navigation 1500€ together for 58600€. I miss 18" wheels and wireless charger but I have power trunk lid.
This could NOT be an upgrade for me in future. I have my GS now for only 2,5 years.