First‐year psychology students (N = 213) recorded details of spontaneous comparison with peers two weeks prior to submission and one week after return of their laboratory reports, for three successive assignments. Results showed that students did make comparisons, particularly after receiving feedback about their performance, but that a sizable minority did not compare at all despite numerous opportunities to do so. Over the three reports, the frequency of comparison prior to evaluation decreased; comparisons after feedback were more frequent, and increased over reports. While comparison with others similar in ability was the most frequent choice, comparison with dissimilar, better others was also common, particularly after objective feedback had been received. The impact of comparison was not generally as predicted by social comparison theory. Although certainty in predicting grades increased over time, it was not as a function of comparison; nor did accuracy increase with increased comparison. Satisfaction with grades varied directly with level of performance. There was a marked lack of interest in downward comparison; regardless of ability level, subjects expressed a desire for additional comparison with better others. The study highlights the importance of longitudinal studies of spontaneous comparison to test the relationship between initial uncertainty, choice of comparison others, and their impact on ability assessments.