Some of the Sahaba would look at a beautiful woman in Salat [authentic Sunni narration]

We find in Sunan Tirmidhi


حدثنا قتيبة حدثنا نوح بن قيس الحداني عن عمرو بن مالك عن أبي الجوزاء عن ابن عباس قال كانت امرأة تصلي خلف رسول الله صلى الله عليه وسلم حسناء من أحسن الناس فكان بعض القوم يتقدم حتى يكون في الصف الأول لئلا يراها ويستأخر بعضهم حتى يكون في الصف المؤخر فإذا ركع نظر من تحت إبطيه فأنزل الله تعالى ولقد علمنا المستقدمين منكم ولقد علمنا المستأخرين

سنن الترمذي » كتاب تفسير القرآن » باب ومن سورة الحجر

Ibn Abbas says that there was a woman who would offer prayers behind Holy Prophet asws, she was beautiful amongst the most beautiful in people , so some in the Nation would go forward till they reached first row so that they do not see her; while others would stay behind till they reach the last rown so that they can see her from their underarms when they would bow. Upon this, Allah revealed: and We know who moves forward in you and who stays behind [surat ul Hajr, 15]

SUNNI REFERENCE:-

1- Sunan Tirmidhi, urdu version, 2/314, narration 2915

2- Sahih Sunan Tirmidhi, Albany, 3/264. Sheikh Albany terms it Sahih

Here some more authentic narration's scans are same mentioned which proved that there were some companions(sahaba) who  looked at women during prayer

Now after this we ask our Sunni Brothers Will you still believe that all Sahaba were good and there were no such people as mentioned above??
Sahaba were also human being and like other people there were good and bad among them.