I just got the HE400i 2020 a few days ago and I am loving them. From everything I have watch and read the Sundara are an overall better headphone but it would not be a noticeable upgrade because the HE400i 2020 is so close to the Sundara. Am I right in saying that?
What would be a noticeable upgrade from the HE400i 2020 without going crazy on price?
Also, what closed back headphones have great soundstage?