It does not directly answer the question. But same is said for the ones having opted Physics. Maleeha Iesar, the topper of CE-2016, had opted Physics. By analogy, she should not have secured good marks owing to the argument that technical / science subjects like these take too much of time.

Plus, this time, there are a good number of candidates who had opted CS as their optional and still got through. I got this information from a DD in FPSC.

My own score of CS in CE-2016 was as follows: Paper l : 69, Paper ll : 74. I failed in Essay. CS is a piece of cake for anyone having a solid background in CS.