I concur, the F138 nose is higher slimmer etc. I'm just reminded of the FW26 wider vertical panels running from the very tip of the nose cone curved down to the horizontal wing.
I'm not suggesting FW26 is same-identical nose cone of F138....they're not even close...but I'm reminded of the similar idea connecting tip of nose to vertical panels
It looks like this year, only the F138 has more carbon fiber material bulking up the vertical panels starting from the very tip of the nose....before the pronounced vertical line down to horizontal wing. The bulked up part, although not curved per say, does present a "connection" between the very tip of the nose to the vertical panels. Other teams vertical panels are recessed back a few centimeters from very tip of nose cones tip.
http://twicsy.com/i/qGrHid