I've wondered the same. Asked and answered thanks OCTA.
The turbocharged Airvan8 is almost 50kg heavier than the NA model, I'm assuming the new 206s suffer the same penalty or have they upped the gross weight?
I don't know the numbers but my guess would be a new amphib 206 mustn't be a great lifter, lugging around 50kg of basically useless turbocharging equipment at the low level these aircraft normally fly.
rocket66 there's another up in Cairns, privately owned but the owner used to hire it out to Cairns seaplane operators. If you're up that way (seeing as no one else is these days...)