First, do not update your computer unless you know why you're doing it. "Because I like to play with new devices" is perfectly good (well, maybe it is not so good), and it is a very common reason, but instead I will concentrate on the possible reasons that have some photographic aspect.
There are, in reality, two of these:
- because the lens you have is not good enough quality;
- because the lens you have will not do what you need to do apart from the limited sense of the original quality.
I will ignore (1) because I am pretty sure that the Canon 50 / 1.8 lens is perfectly fine. People become obsessed with the magical qualities of lenses and like to think that these qualities will somehow make a big difference in their photographs, but almost always they will not. And before they reject me for not understanding the lenses: I have a fairly substantial collection of lenses, some of which are said to have almost mystical qualities (and in some cases actually mystical qualities), and at least one of those that had specially manufactured Sand Gnomes imported from the moon. I love them, especially moles, but they just do not make me a great photographer.
So leave (2): will the new lens do something photographically that the old lens will not? Well, yes, it will:
- it's about half a stop faster;
- it is wider, its field of vision is different;
- … and there may be other characteristics associated with this specific objective that I do not know.
For (1): half a stop is not much: you will not really get a shallower DoF, since the lens is also wider and is not such a big gain. Do not buy it for this.
For (3) I do not know. There may be some specific considerations for this particular combination of lens and / or camera.
But (2) is the big question, and where does it come from? know why you want it.
The 50mm lens you have is a slightly long lens in a camera with culture sensor. It's probably a lovely lens for portraits, but it's quite long for the way people tend to wear glasses for, say, street photography or the environment.
The 35mm lens will be much closer to the traditional "standard" field of view. It is still quite longer than many people use (if I'm right about the Canon clipping factor, which I think is 1.6 not 1.5), but many cameras used to come with 55mm lenses that (remember this was for film 35 mm) has approximately the same field of view as this lens.
Well, what to do? you you want to be able to do? If what you want to do is make portraits of people, then the 50 mm you have is probably the ideal one. If what you want to do is more like street photography, then 35 mm may be better, but you could also consider something wider: if I'm right about the Canon cultivation factor, then a 25mm The lens would be approximately equivalent to 40mm at 35mm in terms of field of view, and this is a beautiful length.
So, as I said, it depends on what you want to do, and Only you can answer that question. In particular, the 35mm lens is do not Only a better version of the lens you have: even if it is better, it is not the same field of vision and you would want to use it in another way.