I am an owner of the old altis,
I can deffinitely say that the new one is better.
front seats of the old altis are very un-comfortable, as well as the driving position, it makes the driver tired even on a 3 hour drive.
the previous one was lighter so a touch quicker through the start.
they both have same engines but the new one has an electronic throttle and electronic stearing wheel, both have cats and the new altis has a better fuel consumption on highways because of its overall dynamics, the new one is wider and has a little less ground clearance, so it handles faily well although the both have same suspension mechanism.
the new one is less noisy in the cabin and i really like the driving position and the cruise contol since its very useful on highways.
the newer altis brakes are not like the old ones its much better almost as same as the camry it doesnt only have ABS it also has BA (brake assist) and EBD (Electronic Brakeforce Distribution) and i have my self seen the larger brake pads of the new altis as compared to that of the old.
the newer one is much better looking also, and the sr comes with leather seats as well
BUT yes the price of the new altis is a bit too high, but thats the trend of the overall market now.