The major change in technical regulations for this season was always going to test the teams' engineering structures in terms of how they deal with change, rather than just working on the optimisation of a theme. After the first half of the season, a picture is starting to emerge.
Performance of some of the teams seems to be more circuit-specific than it has been in the past. I think this is down to everyone finding their feet in terms of what aerodynamic efficiency levels to accept for the new regulations.
Lots more downforce is available from the front wing, bargeboard, underfloor and larger rear wing areas, but the wider tyres increase the car's overall drag levels. The big question is what drag level is acceptable when signing off aerodynamic components.