I hit this morning with freshly strung Hyper-G Soft and Hyper-G, both in 1.20 gauge and in matched racquets. To summarize, these strings are much more similar to each other than different from each other.
I got about an 80 minute hit in with my son. Neither of us were feeling it this morning - I was suffering from wrist and general body soreness from going hard the past few days, and he's only hitting once a week. We were also playing on pretty fast indoor courts so we pulled out a bunch of once-used balls to try and slow things down. My sore wrist actually helped with discerning differences between the two strings but in general neither of us had stellar timing or movement today.
Hyper-G is as I remember it. It's a pretty muted, relatively soft string with average power levels and very good spin capability. Hyper-G Soft, surprisingly, has a much crisper feel with a more distinctive high pitched "thwack" off the strings. It has a very slight bit more power, and a slightly higher launch angle. Pocketing feel between the two is relatively similar, and the sensation is a bit stronger with Hyper-G Soft. Despite the enhanced impact crispness, Hyper-G Soft also is a little bit more comfortable. My wrist hurt less on mis-hits with Hyper-G Soft and felt less achiness after 30-35 minutes of straight hitting with it. The fast courts made me pretty consistently late on my forehand so I ended up hitting with a relatively immobile wrist to minimize the pain and maximize my ability to time the ball well, but I could definitely tell a difference between the two.
I forgot to charge up my phone so I only had the ability to record about ten minutes of video. I'll link to about eight of those minutes. In the last video, I even did an #oserver 360 spin-around at the 2:10 mark. First two videos are with Hyper-G Soft, and the last two with Hyper-G. I did hit for a couple of minutes with Hyper-G Soft right at the end to confirm if I still had the same impressions about it after hitting with regular Hyper-G, and it did.
RacquetTune says that the current tension is 45.9 on the Hyper-G Soft and 45.4 on Hyper-G. The tension drop that has been a slight amount less with Hyper-G Soft is probably within measurement error.
Solinco Revolution was a string I really liked. I last tested it probably 15 months or so ago and I preferred the crisper response and liveliness compared to Hyper-G, but it wore and broke quickly, and also suffered some playability changes as it lost tension. It seems like Hyper-G Soft has taken a big step towards the feel of Revolution.
The videos: