differences between やはり and さすが

Question

In such a sentence as 疲れているが、やっぱり行くつもりだ can you substitute やはり　with さすが, with the meaning of "as one would expect", "also", "as I thought", "still"? how does the meaning change in this sentence?　I can't grasp the real meaning of both adverbs in their daily usage.

Answer 1

• やはり

1) 'after second thought'. In this usage, the colloquial form やっぱり can be used.

疲れているが、やはり/やっぱり行くつもりだ。
'I am tired, but after second thought, I decided to go.'

2) 'as expected'

バーゲンセールに行くと、やはり人だかりだった。
'When I went to a bargain sale, it was crowded as I expected.'

• さすがに　'as expected from the severe level of ...'

疲れているが、さすがに行くつもりだ。
'I am tired, but I am going to go as expected (because I have been absent for so many times, and it is severe now).'

バーゲンセールに行くと、さすがに人だかりだった。
'When I went to a bargain sale, it was crowded as expected (from the unbeatable deal they are offering).'

• さすが '... (= a positive thing) expected from the characteristics'

疲れているのに行くとは、さすがだ。
'It is tremendous of him to go even when he is tired.'