Juniper QFX5100-48S vs QFX5110-48S

I have a bunch of QFX5100s in my network (both the 48 and 96 port variants) and recently started looking at the QFX5110-48S as an easy way to add 100G at some of my sites. The thing is, the QFX5110 costs less than the QFX5100 despite having QSFP28 sockets (vs the QFX5100's QSFP+). Looking at other specs they seem to be relatively the same as far as PPS, max routes, etc., although the QFX5110 does consume significantly more power. So my question is... what gives? Why are the QFX5110s cheaper? Heck, even QFX5200s seem to cost less than the QFX5100. What am I overlooking here?