Actually it's quite hard to get a fair comparison. If we compared sedan US launch price for previous gen (start $17,740 SkyActive-G 2.0) with the 2019 gen (start $21,895 SkyActive-G 2.5), the baseline model increased by USD4.1k. But if compared both gens with the same engine (2.5L), the price is similar (~$21.9k) but the previous gen 2.5L is slightly better equipped.
IMHO, due to over car tax structure, Bermas may choose the SkyActive-G 2.0L as baseline and the SkyActive-X for highline. Quite sure the price will increase and more expensive than competitions because the it will be better equipped. Look at the current gen Mazda 6. The baseline is more expensive than Honda Accord by quite a lot.
To be honest, both cars are decent in their own right (although malaysian market by default will err more towards honda regardless).
Read the autocar uk website review on the new mazda3 (with the current engine) :
Mazda made torsion beam surprisingly good.
Comfy, the Toyota would the best. I drove the CHR (which shares the platform), it is a damn good platform.
Sporty, the Mazda is the sportiest. But suffers from road noise. The GVC version is really good.
Civic, is the largest. Tons of leg room but the handling is pretty poor and its CVT gearbox is rubbish
Civic handling is "ok" due to the low centre of gravity. But suspension tuning wise, it's more towards comfy side.