We (newly married but together for 10 years) have personal accounts, personal savings, joint savings, and a joint "everything" account. We contribute 50-50 to the joint account every month.
I earn about 65% of Dp's salary, but it's still a decent salary. Dp's is just high.
Anything for both of us, or anything for general life for one of us that isn't "luxury" comes from the joint account. If it runs low, we top it up from the joint savings. If that runs low (fairly regular occurrence when big expenditure like car fixes etc come out), Dp tops it up. He also overpays the mortgage every now and then.
We recently went on a big holiday - Dp covered the vast majority of it, and does every time we go away. If I want something expensive, Dp tells me to get it on the joint account and ends up topping it up. So on the face of it, it's unequal because I have a lower salary but pay 50% of bills, but Dp ends up spending an awful lot more on both of us without complaint. He's also given me money for my savings to make use of ISA caps etc.
It works well for us, and while I don't know what he has in his account at any one time, nor does he know what's in mine, neither of us would let the other go without, nor would we let the other fritter money away.