I like this NASA chart of specific fuel consumption on transport turbines over time:
https://www.hq.nasa.gov/office/aero/events/encompat/soaeng.pdf
This is the Embraer E-2 of Brazil, with the P&W GTF, look how low they hang (and they raised the wing line already!
As it inevitably skews towards bigger chord geared turbofans with huge diameters, planes are going to look different because they are running out of space below the wings.