There isn't really any good reason to isolate it to current generation only. If you do that, you're going to be missing significant parts of the picture.
Total hardware is the most interesting metric, as it's the only metric that's very clearly defined. Software could be measured in very many ways. Retail games sold, total amount of games sold, total amount of non-indie games sold, total revenue from games sold, etc.
By hardware, Sony is going to sell the most, for the second year in a row. It's worth noting that that isn't actually because Sony is selling a lot of hardware at the moment, but rather because Nintendo is selling quite little.
If you look at the numbers from the start of the year until the start of August (which is the most recent weekly chart), the numbers are as follows.
2015:
Ps4: 6462k
PsV: 2629k
Ps3: 1019k
Total: 10110k (10.11 millions)
In the same period of 2014, it was
Ps4: 5492
PsV: 1457
Ps3: 2159
PsP: 457k
Total: 9565k
In other words, total Sony hardware is up roughly 5.5% over last year. If we then compare last year to the previous years;
2014: 21044
2013: 18859
2012: 20044
2011: 22646
2010: 23139
2009: 22852
2008: 24252
2007: 20706
We can see that if the 5% increase sticks, then 2015 will in fact be roughly as high as all the years of the seventh generation. Keep in mind that 2007 and 2008 lacks the Ps2 sales of the period, which were significant.
