Adam is correct.
If you can audition a full loom of Alpha V2 and Sigma V2 in your own system, you should do that. From the info I've been able to gather, Alpha V2 surpasses Sigma v1 by a ways. You may find that, depending on your system and room size, a full Sigma loom may be awesome or...it may be..too much. The performance envelope of this new ranges of cables is very large. When I had the Omega XC PC in for photography, I auditioned it with my Everest, and its performance envelope is absolutey amazing. But it was also too much horsepower for my small listening space. In my space, it was like driving a 1500+ HP Bugatti Chiron on a tight twisty road. I simply do not need that much horsepower, and in my space, its...too much. Sigma XC is a better match.
Same applies to other cables on other components. I listen in a small space, and while the Sigma PCs are amazing, in my specific listening space, Alpha NR v2 on my preamp and DAC was a better match for my system in my
room.
BTW, the most important part of your system is...your room. Folks forget about this all the time. And, the components, including the cables function as a system and they
interact with your room. You may find that a lower level cable, e.g. Alpha, and yes, even Delta (which outperforms the previous Alpha level cables) and/or mixing and matching, may be the best setup for your
room as part of the overall system.
This is why Caelin and Shunyata Research offer a range of products with range of performance and functionality over a range of price points. They can be mixed and matched so you can get everything
just right with your components and your speakers in your
room. Don't forget about the room. Think of it as what it actually is, a
system, and not just one thing, a loom of cables.
You may well find that can create a superb and very engaging system and also save quite a bit of money by going with Alpha, or a mix of Alpha or Sigma, or as I've mentioned, Delta.
As I write this, I've using an Alpha PC on my preamp, Delta NR v2 PC on my DAC, and Delta SPs on my Harbeths and listening to Yeol Eum Son and The Academy playing Mozart's Piano Concerto No. 21 in C Major, and...it's
wonderful. What I'm
not doing is sitting here listening to
gear and thinking,
"Man! If only had Sigma* on the pre..." :
Rather, what I'm thinking is what a delightful pianist Yeol Eum Son is...
So, give full consideration 1 or 2 levels down and/or mixing and matching. You don't always need a 10,000 HP nitro Funny Car to go from Point A to Point B, and I would say, in some cases, you don't want to.
You can use the money you saved for taking a nice vacation with your family, or when its safe, going to musical concerts again, etc.
Have fun and keep us in the loop with what you do and what you find out. Cheers.
* - I did have Sigma NR v2 PC on the pre for the review I wrote for TAS. It's...amazing. And....I returned it to Shunyata after the review period. I found in my system and room, Alpha NR v2 was a better match on the pre as had the just right qualities that created the most engaging and immersive experience for my system and room.