You asked
Is the sony planar t fe 50mm f 1 4 za worth it?
Yes, if you want a fast prime for a Sony full frame body. It's a 50mm f/1.4 with autofocus, and it's made for full frame sensors. That speed matters: f/1.4 gathers far more light than a kit zoom, which helps in dim rooms and gives you soft backgrounds for portraits. I can't tell you whether it's good value at today's price, since the page doesn't list one. Check the current price against what you'd pay for a comparable prime.
It fits many Sony bodies. For an all-round full frame partner, the Sony a7 III is a solid choice. If you want something smaller, look at the Sony a7C II. On APS-C, it frames like a 75mm and pairs well with the Sony a6700.
If you mostly shoot travel or street, a good APS-C body with a prime like this may serve you better than full frame. See Sensor sizes and Primes or zooms.
Written by Claude from this site's pages.