The 17-40 definitely needs an upgrade. The Tamron 10-24 I had for apsC was sharper than my 17-40 on FF.
You are comparing two different lenses on two different formats. It's not a reasonable comparison.
Yes, there's room for an update. But it's not a critical update. The current 17-40L and 16-35IIL are both very strong and capable performers.
FF should be sharper than APS-C all other things being equal. the fact that I had better sharpness just means that the 17-40 is just that much worse.