EX1R is much MUCH better. AbelCine did a test to show this when the camera was released. It's a problem Sony fixed but never mentioned in their literature. ;-)
Well if you just want a filter to protect your lens then B+W multi-coat is a good choice. The IR contamination the EX cameras are known for (EX1R not included) is known as "far-red" and is not the typical UV infrared that film cameras were suseptible to.