The UK price is not going to be what they charge here in the states. They price the vehicles based on the market.  Remember, the Canadian price for the Stinger is lower than the US Stinger and they got more equipment than we do. Their 2018 launch price $50K, the equivalent would be roughly $40.6K here however, our GT2 AWD was around $52K if I remember correctly. Going the other way, our $52K price in a straight conversion would be $64K CAD. They will price it lower to get folks to adopt it here.  Folks are coming around to KIA but not many will agree to pay the Stinger's price, even though we know it is a great bargain over here, compared to its competition. We just have to wait to find out our price and incentives when it comes out.
The other issue is electric vehicle adoption in the US. KIA hasn't been selling their electric vehicles at a high rate here and for 2021 they didn't bring any PHEVs for the K5 or 
Sorento to the states yet. It is better to sell in places that have a higher adoption rate and incentives to get folks into an EV. The 
Sorento UK and Europe launch vehicle was the PHEV, so it is not like they don't have one in their line up to bring to the US. The EV6 range is stated up to 316 miles in the UK for the long range version, that is most likely not going to be the same here however, having a fast charging (18 minutes from 10-80%) system for long distance driving, will get you back on the road faster. This will be an attractive feature for a lot folks in the EV world and those new to it.
On a comparison to the Audi e-tron, I think the EV6 will come with a better range but lack the luxury feel of the Audi. One area KIA has been slacking on for their vehicles is using better insulating glass and sound deadening materials in their vehicles, at least for the stuff we get here. It's better than a some other non-luxury vehicles but even the new K9 didn't block out road noise to compete with the Europeans. Will this change with their EVs and newer vehicles? Time will tell. The e-tron drives and feels luxurious, the tech is also pretty good.  Knowing German vehicles, tech can sometimes be a pain, this is where I feel the Koreans have them beat. They might not be as fancy but what they give us works very well. Add in the kind of warranty they provide and it makes getting one a no brainer.  While I like the look of the EV6, I wish they had other options as well.  The Genesis version of the E-GMP platform's first vehicle will be the best of the batch and the one with the highest cost and even that I can't see them selling at $80K. The upcoming Audi Q4, which is a compact car, will be a competitor and that should start around $45K. I think the EV6 GT will end up around the current Stinger's price point or slightly higher. That Q4 will probably top out at $60K, making the Genesis version a better value as it will come with more features for about the same price.  All this is speculation until the cars are on sale and we know the full specs and prices. With a Model Y Performance in the $60K range, I don't think KIA would want to approach that at this juncture.