I read opposing comments regarding the 5LE.
Some say they are overall similar to the HE-500 with more extention to both end and less forward midrange. Still warm sounding headphone.
Other say they are a more refined version of the HE-4 (the 4s being a "half-magnet" version of the 5LE with V-shape signature).
The 4s and 500s do clearly have a different voicing so the 5LE cannot be similar to both at the same time :D
I also read the 6s has similar voicing to the 4s...