Looks pretty normal to me. I also grow the purple varieties and they are PUR-ple. That one isn't nearly as purple like they are.

Assuming your soil has adequate P in it, which most all do, then the cooler springs temps can often create the look of pink/purpling of many varieties of young plants as they have a bit of difficulty absorbing phos when the roots are cool. Usually disappears normally as the weather warms and the plants mature.

Dave

Due to a series of accidents I have three types of 'gus in my bed. And one of them is purple. My FIL used to have a giant bed of white asparagus which, my wife says, was ten times better than my own. so you just have a little mix in there.