The average block time is the same, about ten minutes, and so is the resulting average number of blocks found per day. Increasing hash means increasing competition for that fixed amount, thus "difficulty". Total hash is presently over 500 petahash so in the next months you will hear the term exahash (EH/s).
I remember the time I had 10 TH at hashnest and that was a lot. These days i got over 80TH and I am still a small fish. Some really rich people are into mining these days.