I got the Katja tights about a week ago from PS as part of a testing campaign. TL;DR: love them, true to size, and you should order a pair!
So, first impression - I love the material, it's a bit firmer than some tights (I normally don't like tights!) but still stretchy and comfortable. The grip isn't over the top on the knee (I got the HG). Color is gorgeous and rich. Stitching, general workmanship is quality.
Fit: better than expected! I had read reviews that the waist is too tight for women with hips, so I ordered an XL. This was a bit big - I can still wear them with a belt, but my second pair (ordered) I chose L, which is my normal size. For reference, I wear a 42 in the Martina breeches, am 5'11'' and about 185lb. The tights are also long enough, so tall women rejoice!
Comfort: love the material - can easily be a 3 season breech. Super stretchy and a nice medium to medium high rise. The sticky knees are not overly sticky - I ordered FG for my next pair. Wide waistband is very comfy.
Features: love the dual pocket - the sticky one is nice for my phone and plenty big, and the other for horse cookies, of course (or $$ for my trainer! 😆). The wide waistband and "X" double loop in the back make these easy to wear with a belt, too, which isn't common in riding tights. Very washable, haven't had any issues.
And, the color is gorgeous! I love the plum, in my pictures it is paired with the off-white Everly Top. Would match a lot of colors, and I've included a photo next to the Wivianne top in Wine - the Plum has a little more blue in it.
⭐⭐⭐⭐⭐ - 5/5, already ordered another pair 😂