Shimano's Ultegra R8000 crankset with 46/36 chain rings is still the best option for a cyclocross double, but it won't work with the GRX front derailleur. - Cyclocross Magazine - Cyclocross and
Shimano 105 Vs Ultegra Vs Dura-Ace: Weight, Cost, Spec Comparison | The Pro's Closet
Shimano HG701 Ultegra and XT 11 Speed Chain | Wiggle