If, as Les says, there is a full grade difference between cold cathode and condenser enlargers. (I've never used a cold light head). It isn't surprising that a photographer going from one to the other would be initially disappointed with the results from his negatives. After all, we all do those boring film tests to tune our negs to our own methods and equipment. I have a feeling that once someone adapts his whole process to the characteristics of the light source of his enlarger, the difference in results will be fairly subtle.