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Yes, the Civic HX with the CVT has a 4 wire o2 sensor instead of the wide band 5 wire o2 sensor, so it doesn't have lean burn with the CVT either, so what separates the HX's engine from the EX's engine? on the HX the cam shaft is less aggressive and the valve timing is not the same, the HX has a smaller exhaust with the o2 sensor right next to the head and the catalytic converter right after, while the EX has the o2 sensor farther down stream.
They are different enough engines that they don't even share the same intake manifold, fuel rail or a handful of other parts.
Personally, I'd say if you like the EX enough that you would want to swap over EX parts to an HX, then get an EX, otherwise you will be bogging down a nice light weight civic HX, but if you are starting with an EX then anything you will do will improve it's mileage and you'll have a proper working sun roof, power options and all your frills, things that a lot of us buy Civic HX's to avoid.
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