Life sense and stormlight.

[Emi Elfy]

I was wondering, since people with enough Breaths for Fourth Heightening can feel people around them with breaths, and better the more breaths they have (That's what I understood anyway) but can't sense drabs...

That leads me to believe that they can sense the investiture in a person(?), so I'm wondering if they would be able to sense a surgebinder holding stormlight, or even infused spheres, based on their life-sense.

[Yata he/him]

Lifesense detect Innate Investiture (mostly the Investiture in your soul) while Stormlight is Kinetic Investiture, so Life Sense could not sense that, but a Lifesense user could detect Spren and probably the Radiant the spren is bond with

[Wreith he/him]

Spoiler

We know from his interlude in WoR that Zahel can sense both Kaladin and Syl separately.

He knows someone's coming but doesn't know who. When he sees Kaladin, he thinks it's the guy with the spren he can always sense flying around. 
Implies to me that he can't sense the spren now. Just Kaladin.