When I looked at salary sacrifice for NHS the Audi EVs were considerably cheaper than Fords Mach_E, Kia EV6 and Polestar 2s. The only ones cheaper were the Ioniq5 but it is utterly hideous and vomit inducing to look at IMHO.
I think the thing with leasing is the expected residuals. After 3 years of leasing a Kia, Ford or Hyundai, they will be worth a fair bit less than an Audi on the used market. When I first went electric I chose an E-Tron 50 despite it's lack of range compared to an E-Niro or Kona EV, because the Tron 50 was less to lease per month. I don't give a crap if it has 100 miles more range, I would rather spend 30 minutes charging up 3 times in 18 months than compromise luxury and comfort the other 99.999% of times I drive.
I chose an Q4 50 Sportback as the replacement lease because the leasing price is a fair bit cheaper than the Mach-E and the Kia EV6. Almost £50 per month less in both cases. Even if perceived* quality is much the same the fact the Audi was cheaper is far too hard to ignore.
* the Mach-E had a very flimsy door card that bent when you put minor pressure on it. The EV6 floating centre console had about an inch of give in it if you checked for robustness. The Audi Q4 had a bit too much use of hard plastics but was more solid than the EV6 and Mach-E.