Original Intel does state Voh at 80uA, the NMOS chip. Atmel state Voh = 3.8V @ Ioh=25uA.
So in fact Atmel chip should have an inferior performance, which is not the case.
Further Philips chip still has a higher supply current as compared to Atmel. How many specs have to be compared, if a uC cannot drive a classical darlington array, I wonder how they figure out the chip requirements to design with? More so this with an existing design which in production by my customer, so that makes every uC design a future dangling sword on both our heads. This is precisely why we have microsoft jokes on compatibility issues.