I think you guys missed the power consumption of batch 1 1375 and batch 2 1275.
If you calculate it u will see that B1 and B2 are equivalent.
That's correct but I don't think anybody expected the efficiency to be different. The price should have been lower considering later delivery. All other things being equal Batch 1 owners will have 8 extra days of more profitable mining. It will be interesting to see how it compares in real life though when things start getting delivered, what's the next diff jump, etc.