Almost all teams using 2017 Ferrari type sidepod inlet that flow over the upper side-impact structure. Predictably, Ferrari has the most extreme Ferrari intake.
Undercut on sidepods has reached pretty consistent new extreme, at least in half of the field. Merc and McLaren seem to be using last year's old extreme undercut. The mid-bodywork on all cars (sidepods and engine covers) have delicious curves.
Colors are consistently good too, oops not technical comment.
Force India has done great with the nostril-nose over the last two or three seasons, totally punching above their weight. Yet no copies (except for the awkward Sauber nose, maybe?). Maybe the top teams are too gun-shy given the generally failed history of gimmick noses. FI may have a gimmick that works.
Suprised that no additional teams have gone for the Mercedes/ToroRosso front suspension with upper balljoint outside of the wheel.
The Merc cape under the nose (itself a more extreme version of previous devices that probably started several years ago with the McLaren cape) is being used on several cars this year.
There is pretty clear convergence in most aero free-zones such as front wings. But the barge-board area still looks different on every car. More complicated with each passing year, but every car still different. Red Bull is the one exception to complicated, but that proves my point about different.
Wheelbase converging towards ultra-long Mercedes dimension, not what I would have guessed as recently as 2 weeks ago. Will be interesting to see if shorter wheelbases (McLaren?) work well. It's known that tradeoff of ultra-long wheelbase is more weight. Would LOVE to be fly on the wall when cars are weighed during Melborne tech inspection. Why are weights kept secret?!?!--> Fix this Chase, Ross, et al !
Suspension a-arms going further from structural ideal and going more in direction of ideal aero vanes.