These are comments from the perspective of being asked to edit many recordings.
The OKM IIs are, by far, the best in-ears I've heard. They are usually perfectly matched. However, all the users I know have issues with them falling out occasionally.
By contrast, the Sound Pro equivalents have an excellent retention system and are said to be comfortable but, and it is a huge BUT, they are usually horribly mismatched. Typically, this is a HUGE dip in response of one mic, from about 3Khz-upwards. Without major surgery, the recordings are impossible to listen to on phones. I'm afraid, having seen this a number of times, I would not recommend them to anyone without a cast iron guarantee they are matched within specified limits. The customer service is good, and they will replace, but shipping to N. America and back is a real pain, which is one reason OKMs are more popular over here.
Church doesn't do in-ears, but the quality of his mics are very high. I have a set of CAFS and love them. But, as stated above, you're not comparing like with like.