There is an improvement, but still not as easy to read as the "old format".
Most of the green type is easy to read, but the black/grey of the content of the message should be considerably darker.
And as for the typeface under the heading "Quick Reply", it is very difficult (for me) to read and the tag "Quote" on the right of the header is almost indiscernible.
As I suggested before, the colour scheme may be pretty, pretty, but not very practical.
I read and enjoy most messages on a regular basis, but unless there is more improvement, my readings will become less frequent - my loss, I know.
Pity it seems to be change for change's sake.
And we still don't know what prompted the change.
If it aint broke, don't fix it.