I have had the regular ember on my Oasis, but I can't read non serif fonts. I wish bookerly was just a tad darker so I mostly use caecilia as its a bit darker.
If they can add a bold non serif, they should be able to have a serif one also.
I am so used to caecilia since its whats been on kindles since the first. Heck, there was just that one font on the K1 and I read on it just fine for 2 years. It looks so faded now compared to the newer screens. Course my eyes are 8 years older now too.
