Can you please share what you mean by this? Cost of funds for idfc first is now 5.2% blended (including 22k cr of high cost legacy liabilities at around 8.5-9%).
HDFC bank for comparison is at 4.2%. I would not be too surprised if idfc bank converges to within 0.5% of HDFC within 2-3 years. Do you think that makes a material difference to what sort of customers they are able to target?